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Three 1TB drives with Same Content - One has 4GB less free space?

Hello all,

I've seen this with many drives in the past and have always wondered about it but cannot find an answer: I have three 1TB drives all with the same content (one internal, two external), even down to the number of files. Two of them (the internal and one external) show the same disk size/free space but the third has 4GB less free space. Anyone know why this is?

Thanks
6 answers Last reply Best Answer
More about 1tb drives content 4gb free space
  1. Hard drives usually dont have exactly the available storage space specified;it varies slightly on weather there any bad sectors on the magnetic plates, and how many. It is not uncommon to be 10% down.
    A drive with a back up or system restore factory reset partition will
    also show up less available space.
    I do believe the loading files for windows are usually 4 gig so that might be you answer.
  2. depends on what your storing but could be the one uses a different cluster size, with lots of smaller files that can mean files take up a lot more space then the physical files. when you select all the files can you see size and size on disk? is so do all three sizes match but size on disk very if so this is cluster file size causing it.
  3. maxwellmelon said:
    depends on what your storing but could be the one uses a different cluster size, with lots of smaller files that can mean files take up a lot more space then the physical files. when you select all the files can you see size and size on disk? is so do all three sizes match but size on disk very if so this is cluster file size causing it.


    Here is a screenshot of the drives properties. Keep in mind these all have the exact same files on them.

  4. use a program like or http://download.cnet.com/SizeExplorer-Free/3000-2248_4-10891060.html

    compare its results from one of the two drives to the middle drive. somewhere you have an extra 4gb file. most likely its a hidden file of some sort and this will help you locate where its at.
  5. maxwellmelon said:
    use a program like or http://download.cnet.com/SizeExplorer-Free/3000-2248_4-10891060.html

    compare its results from one of the two drives to the middle drive. somewhere you have an extra 4gb file. most likely its a hidden file of some sort and this will help you locate where its at.


    Thanks but that didn't give me any new info. Cnet is terrible now with all the bloatware.
  6. Best answer
    I figured out that the size difference was caused by temp files in the recycle bin associated with the drive that had the size difference, using Space Sniffer.

    http://www.uderzo.it/main_products/space_sniffer/

    Once I found that out, I used an elevated command prompt to delete the files in question, using the method found here:

    http://lifehacker.com/5845698/force-recycle-bins-to-empty-for-every-user-on-a-system
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