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Windows 8.1 100% disk usage

I've noticed my PC running at 100% disk usage on more than one occasion. AVG seems to always be at the top of the list of disk reads/writes. So maybe this is the culprit?

I'm pretty sure nothing is physically wrong with my computer as I had issues like this before on Windows 8 (on a laptop) and those issues weren't reproduced when I ran Windows 7 on that laptop.

It can't be a driver issue as the latest drivers (Windows 8 compatible) are all installed and operational. Today my disk ran to 100% shortly after startup and it was so busy doing "stuff" that my PC froze for a few seconds (not even the mouse could move) then it unfroze itself a few seconds later. Like I said, I've had these issues before on Windows 8. I've also googled around and found this is a common problem.

Does anyone know if there is a solution to this? When my PC isn't running at 100% disk usage it performs well.
90 answers Last reply Best Answer
More about windows 100 disk usage
  1. I have looked at several different system that had disk usage near 100% Problem is that each one ended up having a different cause so it is hard to say what the fix would be. But I can give you some ideas to help isolate the cause down.

    You start task manager, select the performance tab, open resource monitor, select disk tab

    then open a cmd.exe as a admin (windows key+x+a)
    now you stop various suspected services and watch how the system responds in resouce monitor.
    for example:
    net.exe stop superfetch (hit enter and see if your disk usage goes down after a min or two)
    net.exe stop "Windows search"

    I mention these two because I have seen disk corruptions that made these two services go nuts and take 100% disk bandwidth

    I have also seen tasks in the task scheduler that did the same thing until you killed the task.

    in all the cases you had to find out the cause of the problem and fix it and the service then worked as expected.

    for example, one case had a filesystem corruption that made a loop in the directory structure such that when windows or any program scanning the files would never end and just continue scanning the same set of files forever. In one case it was building a search index and the database just kept growing and growing in size until all of the hard drive was used.

    in most cases all you need to do is run cmd.exe as a admin then
    chkdsk.exe /f /r on your drives and the condition that causes the problem gets fixed

    there are also conditions where windows 8.1 will really use your disk while it is attempting to relocate data off of bad spots on your disk drives.
    older versions of windows did not do this. windows 8 will attempt to read data from your disk drive even if you have not requested it. It is looking for errors during the read process so it can locate bad sectors before your data is lost. It will read, if it gets a read error, it will read the spot over and over and try to get a clean copy of the data, it will then move the data to a new good spot on the drive and mark the old spot as bad.

    This process can take days on some drives and your system will seem to be at 100% disk used for no apparent reason. It will take much longer on a laptop it the laptop is allowed to sleep. This process is needed because a lot of OEMs do not format and install the os, they just plop a entire OS image on a drive with the assumption that all sectors of the drive are ok.

    (I guess that is another point, turn your system to high performance and let it run at idle overnight and see if the disk is at 100% usage in the morning)

    - there are also software bugs that will peg your disk access at 100 % but these almost always end up being bugs in 3rd party drivers. It is not because microsoft makes great drivers, it is because microsoft has windows update and when a microsoft driver breaks they get 100,000 automatic bug reports and then they put a fix in the windows update and you download the update and don't ever hit the problem. When the bug is in a 3rd party driver microsoft still gets the 100,000 bug reports but they tell the vendor of the driver, that vendor makes a fix and puts it on their website. Now you have to hit the bug, figure out the problem is caused by the vendor, look at the vendors website and hope they put the fix there. Not a fun process. After years of this problems and updates I find that about 95% of the problems are in 3rd party drivers, and you just have to figure out which one.

    sorry if this is not so helpful, it is hard to figure out some problems when you can not actually get your hands on the system.
  2. Best answer
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)
  3. can one fix it ?
  4. the disk is too hot, fan it. everything will be ok : )
  5. johnbl said:
    I have looked at several different system that had disk usage near 100% Problem is that each one ended up having a different cause so it is hard to say what the fix would be. But I can give you some ideas to help isolate the cause down.

    You start task manager, select the performance tab, open resource monitor, select disk tab

    then open a cmd.exe as a admin (windows key+x+a)
    now you stop various suspected services and watch how the system responds in resouce monitor.
    for example:
    net.exe stop superfetch (hit enter and see if your disk usage goes down after a min or two)
    net.exe stop "Windows search"

    I mention these two because I have seen disk corruptions that made these two services go nuts and take 100% disk bandwidth

    I have also seen tasks in the task scheduler that did the same thing until you killed the task.

    in all the cases you had to find out the cause of the problem and fix it and the service then worked as expected.

    for example, one case had a filesystem corruption that made a loop in the directory structure such that when windows or any program scanning the files would never end and just continue scanning the same set of files forever. In one case it was building a search index and the database just kept growing and growing in size until all of the hard drive was used.

    in most cases all you need to do is run cmd.exe as a admin then
    chkdsk.exe /f /r on your drives and the condition that causes the problem gets fixed

    there are also conditions where windows 8.1 will really use your disk while it is attempting to relocate data off of bad spots on your disk drives.
    older versions of windows did not do this. windows 8 will attempt to read data from your disk drive even if you have not requested it. It is looking for errors during the read process so it can locate bad sectors before your data is lost. It will read, if it gets a read error, it will read the spot over and over and try to get a clean copy of the data, it will then move the data to a new good spot on the drive and mark the old spot as bad.

    This process can take days on some drives and your system will seem to be at 100% disk used for no apparent reason. It will take much longer on a laptop it the laptop is allowed to sleep. This process is needed because a lot of OEMs do not format and install the os, they just plop a entire OS image on a drive with the assumption that all sectors of the drive are ok.

    (I guess that is another point, turn your system to high performance and let it run at idle overnight and see if the disk is at 100% usage in the morning)

    - there are also software bugs that will peg your disk access at 100 % but these almost always end up being bugs in 3rd party drivers. It is not because microsoft makes great drivers, it is because microsoft has windows update and when a microsoft driver breaks they get 100,000 automatic bug reports and then they put a fix in the windows update and you download the update and don't ever hit the problem. When the bug is in a 3rd party driver microsoft still gets the 100,000 bug reports but they tell the vendor of the driver, that vendor makes a fix and puts it on their website. Now you have to hit the bug, figure out the problem is caused by the vendor, look at the vendors website and hope they put the fix there. Not a fun process. After years of this problems and updates I find that about 95% of the problems are in 3rd party drivers, and you just have to figure out which one.

    sorry if this is not so helpful, it is hard to figure out some problems when you can not actually get your hands on the system.

  6. thank you so much it worked for me :) sometimes disk goes again at 100% but doesn't lagg
  7. Thanks so much, my disk was at 100% and kept freezing on and off so i did the admin command prompt and stopped "windows search" and everything seems to be normal now.
  8. numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)


    Thank you so much for telling me how to do this. I have been searching for an answer for months now. This immediately fixed my issue. Thank you once again.
  9. numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)


    Thanks a lot..your solution worked out
  10. zayeshk said:
    numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)


    Thanks a lot..your solution worked out



    Could you please tell me how you set windows update checks to manual? I cant seem to find out how to do it. Thank you.
  11. Thanks Bro It worked for me
    More than Fix I got info about the problem
  12. I had this annoying problem too and it was caused by multiple stupid Windows 8 "features".

    I analyzed it to a "deadlock" disk I/O scenario where my computer became totally useless.

    You can analyze the problem down to Resource Monitor, Disk tab "Disk Queue Length", of your C: drive.

    Looking at what was generating all the disk I/O, I observed it was msmpeng.exe which is Windows Defender.

    Also I observed that Windows Search Indexer was hammering the hell out of my C: drive as it read files on my C: drive and then updated it's index also on the C: drive.

    I'll note that the NTFS file system is relatively inefficient at disk I/O, requiring around six SATA IOPS per NTFS write command.

    Of course all this background crap requires pageable memory, so the pagefile got constantly hit causing more C: drive I/O further delaying Windows Defender and Search Indexer.

    Even more annoying was that I would leave it running overnight when it seemed to quiet down, and then instantly started up it's crazy shenanigans as soon as I started using it!

    At one point I thought my computer had been hacked by the NSA or something and was snooping my files in real-time. LOL

    Bottom line my fairly newly installed Windows 8.1 computer ground to a total useless halt where just starting Internet Explorer (or any other program) took several minutes and the Disk Queue Length shot up to 40s and latency around 15,000ms (should never instantaneously exceed about 8 and normally hovers around 1 or 2, with average response times in the low tens of milliseconds.

    My solution (and I realize this may not work for everyone) was to hookup an inexpensive small capacity 40GB SSD drive that had been sitting around gathering dust anyways.

    I suppose I could have also disabled the Windows Search Indexer but I actually use it extensively.

    So I moved my pagefile onto the SSD as well as relocated the Windows Search Index database onto it.

    I also pointed the TMP and TEMP user and system environment variables to the SSD drive for good measure.

    Now my computer runs just as it did when it had Windows XP on it.....
  13. For those who have not found a solution yet, it is likely you have a virus in your computer. A virus called HackTool.Win32 can mess up your computers speed and make every program stutter, whilst causing your Disk usage to peak at 100% every second. I was using Norton Antivirus but deleted it to see if it was causing problems with disk usage. I found out that though it was not directly contributing to the problem, it was not able to detect the virus which was causing the problem, and in turn covered it up. If you are running Norton antivirus then uninstall it, and have windows defender solve the issue for you (threat detected/virus).

    This is one solution to the problem.
  14. Go to: Control Panel/Troubleshooting/System and Security
    Run troubleshooters to resolve problems with: Windows Update, Search and Indexing, and System Maintenance.
    Reboot - et voilà.

    Please make sure to restore wrongly stopped services such as:
    BITS (Background Intelligent Transfer Service)
    Superfetch
    Windows Search
  15. Hello,

    I had also the same problem - i just downloaded CCleaner and used two main options - cleaner and registry repair (in english version it can name different). The problem is probably the memory taken by your web browser things like cookies, download history and cache. Now it works fine for me. Good luck :)
  16. To me the solution was to disable "Windows Search" at Services.

    Thanks for all info.

    Ricardo
  17. I'm experiencing something similar, 100 disk use even when it's just browsers. I've disabled superfetch and stuff like that. Now it only crashes if I try to open big files. Also McAfee firewall keeps hopping off and failure with every scan, what so you reckon I can do?
  18. Brand-new PC. Disk usage nearly 100% though no application was actually running. HD noise was suspicious.
    I read someone saying it was normal as it might have been a background task (e.g. document indexing, defrag, windows update, etc... - see second link below: the Task Scheduler should show what was to run) doing stuff and it would have fixed itself after a while.

    Anyway I solved following these 2 suggestions:

    power management
    http://answers.microsoft.com/en-us/windows/forum/windows_8-performance/high-disk-usage-windows-8-pro/08400095-23e5-4895-865e-1150735c5559?page=4

    virtual memory
    http://answers.microsoft.com/en-us/windows/forum/windows_8-performance/windows-8-keeps-slows-down-to-100-disk-usage-and/cd787f8d-e7b4-4872-aecb-6f0cd15ad942?page=1&tm=1380334962208

    restart the system.

    It helped what Wafiq replied on June 6, 2013 (second link above)
    Quote:
    In order to know which process is utilizing the Hard Disk in Windows 8
    1- Open Task Manager
    2- Go to Details tab
    3- Right click the columns headers and click "Select Columns"
    4- From the "Select Columns" window, check: I/O Reads, I/O Writes, I/O read bytes, I/O write bytes --> click OK
    Now the columns will be added to the view and will display how much each process is utilizing from the hard disk.
    5- Sort by I/O read bytes, or I/O write bytes by clicking on the column header to see which process is utilizing the HD most.

    I also run CCleaner (Cleaner + Registry).

    Update:
    next days, disk clog happened again.
    In my case, I must blame Windows Update though I must credit that it is a background task doing stuff and will fix itself after a while.
    Whenever disk usage permanently reached 100%, I noticed these Processes in the Task Manager:
    Windows Modules Installer
    Windows Modules Installer Worker
    and
    TiWorker.exe in the Details tab
    So, it actually seems maintenance operations were running in the background as I had previously downloaded and installed updates and restarted the system.
    The strange thing about it is that disk clog also appears when a new update is pending. In fact, whenever I hear some noise from the HD, check the Task Manager and see disk usage is constantly at 100% then I open Windows Update and find a pending update.
  19. numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)


    Thanks! Killing BITS also solved my issue. But what does this service does? Is it wrong or bad to simply stop this service?
  20. I had the same problem which occurred immediately after upgrading from 8 to 8.1. I spent a lot of time following suggestions but what rescued me was coming across a post, which at first I thought was a company promotion, saying that CCLEANER would solve the problem with their registry clean-up tool. And it's free. I downloaded the software and ran the registry cleaner three times (rebooting each time) and problem solved. My disk usage is running along at 5-10% and no more time wasted. I was just about to the point of buying a new computer but have to thank this company for saving me the time and money. QUICK, EASY & FREE
  21. I had the same problem which occurred immediately after upgrading from 8 to 8.1. I spent a lot of time following suggestions but what rescued me was coming across a post, which at first I thought was a company promotion, saying that CCLEANER would solve the problem with their registry clean-up tool. And it's free. I downloaded the software and ran the registry cleaner three times (rebooting each time) and problem solved. My disk usage is running along at 5-10% and no more time wasted. I was just about to the point of buying a new computer but have to thank this company for saving me the time and money. QUICK, EASY & FREE
  22. I had seen a solution to this problem elsewhere - open Skype. I tried many of the other suggested solutions, even opened the desktop version of Skype that I usually use, just to test the theory (all of this took hours as my computer was so slow and Skype seemed like a long shot solution). Finally I tried opening the Skype App (8.1) and after taking around 10 minutes to open, disk usage immediately went down to single digits and has been fluctuating normally ever since. Odd, but effective.
  23. This is actually completely normal due to your antivirus quickly reading the process before initiation. I went through this only to find it is normal. Best of luck!
  24. go to pc info. click remote settings. click advanced and performance settings. click adjust for best performance and

    best performance of background services
  25. to check your windows update to manual, you need to press windows+i then as you can see change pc setting at the bottom click that and it will take you to pc setting then you will list of option, you need to click the updates and recover then you got to click "choose who updates get installed" then other page will open and need to change the auto updates setting to whether i install update or not..
  26. thanks you very much,i'm vietnamese,and i know a lot of english,,,i try with your way and see it's great.....
  27. start virtualdisk service... and set it for automatic...
  28. Hello,
    my disk also was 100% in use , was noisy and I lost it , PC was under warranty and HP replaced HD and re-install OS.
    But after 2 days disk utilization back to 100% , I call to support :-) , support person kill all processes on my PC and disk back to normal work , but after restart issue come back . I started to delete all my programs one by one , when I deleted Norton antivirus (it was pre-installe on PC) disk back to normal work .
    I did rollback to all changes and still have a good disk utilization . Then I contacted to HP support, answer was do not use Norton .
  29. any antivirus does this
  30. M4DCRUSH3R said:
    any antivirus does this

    HP recommended windows defender , I never used it so don't know how it is good or not
  31. It does
  32. numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)
  33. numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)
  34. THIS WORKS!! I'm know nothing about computers; I'm afraid to "run" anything, as well as to go on as administrator. I disabled bits, like numair said. Disk down to 1-2%. I turned bits back on-- stayed at under 10% EXCELLENT! So EASY! Thanks!
  35. Well after 2 weeks of dealing with this garbage type problem and trying all the solutions, I realized that every time I use windows media player my disk goes to 100% but when I "end task" it, it goes back to like 0%. Thought I'd share since not everyone has the same solution. Hope it helps someone.
  36. David Br said:
    Well after 2 weeks of dealing with this garbage type problem and trying all the solutions, I realized that every time I use windows media player my disk goes to 100% but when I "end task" it, it goes back to like 0%. Thought I'd share since not everyone has the same solution. Hope it helps someone.

    It is because you are reading a large file...
  37. numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)


    That worked for me! Thanks!
  38. johnbl said:
    I have looked at several different system that had disk usage near 100% Problem is that each one ended up having a different cause so it is hard to say what the fix would be. But I can give you some ideas to help isolate the cause down.

    You start task manager, select the performance tab, open resource monitor, select disk tab

    then open a cmd.exe as a admin (windows key+x+a)
    now you stop various suspected services and watch how the system responds in resouce monitor.
    for example:
    net.exe stop superfetch (hit enter and see if your disk usage goes down after a min or two)
    net.exe stop "Windows search"

    I mention these two because I have seen disk corruptions that made these two services go nuts and take 100% disk bandwidth

    I have also seen tasks in the task scheduler that did the same thing until you killed the task.

    in all the cases you had to find out the cause of the problem and fix it and the service then worked as expected.

    for example, one case had a filesystem corruption that made a loop in the directory structure such that when windows or any program scanning the files would never end and just continue scanning the same set of files forever. In one case it was building a search index and the database just kept growing and growing in size until all of the hard drive was used.

    in most cases all you need to do is run cmd.exe as a admin then
    chkdsk.exe /f /r on your drives and the condition that causes the problem gets fixed

    there are also conditions where windows 8.1 will really use your disk while it is attempting to relocate data off of bad spots on your disk drives.
    older versions of windows did not do this. windows 8 will attempt to read data from your disk drive even if you have not requested it. It is looking for errors during the read process so it can locate bad sectors before your data is lost. It will read, if it gets a read error, it will read the spot over and over and try to get a clean copy of the data, it will then move the data to a new good spot on the drive and mark the old spot as bad.

    This process can take days on some drives and your system will seem to be at 100% disk used for no apparent reason. It will take much longer on a laptop it the laptop is allowed to sleep. This process is needed because a lot of OEMs do not format and install the os, they just plop a entire OS image on a drive with the assumption that all sectors of the drive are ok.

    (I guess that is another point, turn your system to high performance and let it run at idle overnight and see if the disk is at 100% usage in the morning)

    - there are also software bugs that will peg your disk access at 100 % but these almost always end up being bugs in 3rd party drivers. It is not because microsoft makes great drivers, it is because microsoft has windows update and when a microsoft driver breaks they get 100,000 automatic bug reports and then they put a fix in the windows update and you download the update and don't ever hit the problem. When the bug is in a 3rd party driver microsoft still gets the 100,000 bug reports but they tell the vendor of the driver, that vendor makes a fix and puts it on their website. Now you have to hit the bug, figure out the problem is caused by the vendor, look at the vendors website and hope they put the fix there. Not a fun process. After years of this problems and updates I find that about 95% of the problems are in 3rd party drivers, and you just have to figure out which one.

    sorry if this is not so helpful, it is hard to figure out some problems when you can not actually get your hands on the system.

  39. Thanks johnbl your suggestion was indeed helpful! :)
  40. numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)



    You need a medal. This worked instantly. Why the hell does BITS take so much disk usage? Insane. Thank you so much for the fix
  41. numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)


    THANKS A LOT! This solution works perfectly. I used to have 100% Disk Usage all the time that resulted in white screens and very slow response.After disabling BITS, the usage reduced to a single digit. Thank You! :-)
  42. Set virtual memory to custom size, equal to 1.5 times your actual memory. For example, 4 GB of actual ram, set virtual memory paging file to 6 GB minimum, and 6 GB maximum.

    In my case, I tried every other solution described, but nothing else worked. ASUS laptop with 4 GB of RAM showed 100% disk use ALL the time, with about 50% of that by System. Interestingly, nothing else added up to nearly 100%. Nothing was being used, except idle processes, and the MB transfer rate was not even that high, yet HDD showed 100% regardless, never going below that. The automatic system-selected paging file was about 980 MB. The laptop was so ridiculously slow, it was completely unusable. I thought it might be hardware failure, such as the HDD itself.

    The moment (after agonizing clicks and 5 min waits just to be able to get to virtual memory preferences) I changed virtual memory size as described above and restarted, the laptop is back to normal operation, and the disk usage no longer shows 100%, but hovers near 0% except when applications cause a momentary spike.
  43. numair94 said:
    Hi,

    I have been searching for a solution for over a month now and have finally solved the issue:

    Go to charms bar and press search, then type view local services.
    Once here, stop and disable BITS (Background Intelligent Transfer Service). Also, set windows update checks to manual.
    Chrome also seemed to be a factor so uninstall that too.

    I hope this helps you out ;)

    Thank you so much.
    I disabled BITS. I hope that alone solves the problem. May I know how to update checks to normal.
    I agree Chrome doesn't work well in 8.1.
  44. thanks BITS solution worked
  45. johnbl said:
    I have looked at several different system that had disk usage near 100% Problem is that each one ended up having a different cause so it is hard to say what the fix would be. But I can give you some ideas to help isolate the cause down.

    You start task manager, select the performance tab, open resource monitor, select disk tab

    then open a cmd.exe as a admin (windows key+x+a)
    now you stop various suspected services and watch how the system responds in resouce monitor.
    for example:
    net.exe stop superfetch (hit enter and see if your disk usage goes down after a min or two)
    net.exe stop "Windows search"

    I mention these two because I have seen disk corruptions that made these two services go nuts and take 100% disk bandwidth

    I have also seen tasks in the task scheduler that did the same thing until you killed the task.

    in all the cases you had to find out the cause of the problem and fix it and the service then worked as expected.

    for example, one case had a filesystem corruption that made a loop in the directory structure such that when windows or any program scanning the files would never end and just continue scanning the same set of files forever. In one case it was building a search index and the database just kept growing and growing in size until all of the hard drive was used.

    in most cases all you need to do is run cmd.exe as a admin then
    chkdsk.exe /f /r on your drives and the condition that causes the problem gets fixed

    there are also conditions where windows 8.1 will really use your disk while it is attempting to relocate data off of bad spots on your disk drives.
    older versions of windows did not do this. windows 8 will attempt to read data from your disk drive even if you have not requested it. It is looking for errors during the read process so it can locate bad sectors before your data is lost. It will read, if it gets a read error, it will read the spot over and over and try to get a clean copy of the data, it will then move the data to a new good spot on the drive and mark the old spot as bad.

    This process can take days on some drives and your system will seem to be at 100% disk used for no apparent reason. It will take much longer on a laptop it the laptop is allowed to sleep. This process is needed because a lot of OEMs do not format and install the os, they just plop a entire OS image on a drive with the assumption that all sectors of the drive are ok.

    (I guess that is another point, turn your system to high performance and let it run at idle overnight and see if the disk is at 100% usage in the morning)

    - there are also software bugs that will peg your disk access at 100 % but these almost always end up being bugs in 3rd party drivers. It is not because microsoft makes great drivers, it is because microsoft has windows update and when a microsoft driver breaks they get 100,000 automatic bug reports and then they put a fix in the windows update and you download the update and don't ever hit the problem. When the bug is in a 3rd party driver microsoft still gets the 100,000 bug reports but they tell the vendor of the driver, that vendor makes a fix and puts it on their website. Now you have to hit the bug, figure out the problem is caused by the vendor, look at the vendors website and hope they put the fix there. Not a fun process. After years of this problems and updates I find that about 95% of the problems are in 3rd party drivers, and you just have to figure out which one.

    sorry if this is not so helpful, it is hard to figure out some problems when you can not actually get your hands on the system.



    Thanks you johnbl for the excellent write-up. My brand-new win 8.1 desktop was spending over 10 minutes after boot-up with disk activity near 100%. I ran chkdsk using switches you suggested. System stayed at 10% mark for over 2 hours. Finally before the 3rd hour started it completed and the boot sequence no longer has the high disk activity. For reference this was on a 1 TB SSD Hybrid drive (HP Pavillion all-in-one).
  46. I started having a problem with the disk running at 100% a couple months ago. After searching through related threads, I figured out that my problem was OneDrive related. Each time I stopped the OneDrive Sync Engine, the Disk percent would normally make a dramatic drop within a minute. I turned it back on, so I could get most of my files backed up, until I come up with a better (inexpensive and simple) back up solution.

    My files, finally, finished syncing to OneDrive, this morning. I restarted my laptop. The Disk stayed at 100% for about several minutes. During this time, the OneDrive displayed as starting up. Once OneDrive finished starting up, the Disk percent dropped again. It is now running in single digits, with the occasional jump to about the 40 to 50% range.

    I thought OneDrive (personal) and OneDrive for Business (college) were great ideas. But, until all of the files sync up, the upload time is horrendous.
  47. thanks
    Its working 100%
  48. Adobe search service wasmy problem
  49. press
    Windows+R
    Write services.msc in the Run
    Disable/close following by right clicking:
    1-Super fetch
    2-Windows Search
    And It Will Work Great!
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