You would also have to disable the automatic maintenance the system attempts to do on your hard drive.
I think it is in the task scheduler.
I assume turning off the prefetcher and superfetch prevent the standby memory from getting loaded.
anyway, if it stays at high disk useage if is often better to find out your systems defect (software/hardware) than turning off systems that are getting slowed down by the defect.
single click every minute or two can be a drive head servo hitting its stop because of bad seek codes provided to the drive controller. (ie, change you drive cables, update your CPU chipset drivers, update you BIOS. update your drive firmware if you can.) people often have problems if they use a large spinning drive and upgrade from windows 7 to windows 8. This is because windows 7 made you responsible for detecting and repairing certain error conditions on your drive. Funny, turns out people don't check there drives for errors until the drive dies. Windows 8 starts a task that does some drive error checking.
It will find and start to test and recover your entire drive during its idle time. People don't do proper formats on drives, they do quick formats to save themself time. Windows 8 will attempt to go thru your drive and locate all the sector markers and read all the data from the drive. if it gets a error it will read the drive over and over until it can get a clean copy. (makes a clicking noise also, the servo in the head moved the head to the same position over and over as it tries to read the data off the bad sector. If it does read the bad sector, it relocates the data and marks the sector bad. Takes a long time when it can not start for 5 mins after idle and people tell the drive to go to sleep after 10 mins.
it takes longer if you have data on the drive the system needs to get before it can mark the cluster as bad.
spinning drives have bearings that ware, the sector markers move, the heads change alignment and they slowly loose start to have problems reading data. Reading a cluster might start out with no errors, then 1 month later get correctable errors , then a few months after that uncorrectable errors. Nothing like a drive taking a few hundred tries to read a sector. it causes your disk queue to fill and your disk gets pegged at 100 %. Yes, the prefetcher will load programs you have not used into standby memory and if you have drive problems your device queue will go to 100 %. it is a disk problem as the root cause.
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