Free space on a hard drive has got corrupted, HELP

  1. Posts : 24
    Windows 10 Pro

    Free space on a hard drive has got corrupted, HELP

    I have 2 8Tb drives that I manually keep in sync. Recently, I have no idea when, the free space on them just got out of step. I've JUST re-synced them but at this moment there is

    1,416,419,140k (& 70,438 files) free on one and 1,938,941,052k (and 70,435 files) on the other. The difference of 3 files does NOT account for the almost half a terabyte difference.

    I summed all the files and they are 5,808,282,200k on one and 5,778,681,337k on the other. The difference is because I have imaged my system (at different times) to each drive.

    The one on the left (R: 1.4Tb free) is the one that appears wrong.

    Two questions....

    1) Why/How did R: get corrupted?
    2) how do I fix the available "free space" on R: the incorrect drive.

    Sorry, a thumbnail with the same drive somehow got attached to this question and I can't delete it.... Sorry
    Attached Thumbnails Attached Thumbnails Free space on a hard drive has got corrupted, HELP-image.png  
      My Computer

  2. Posts : 4,699
    Windows 11 Pro 64 Bit 22H2

    Press the Win Key+X and choose Disk Management. In the Disk Management window, in the lower pane, does the R: drive have a separate partition without a drive letter or Unallocated Space?
      My Computer

  3. Posts : 8,006
    windows 10

    Are the clusters the same size on both disk as that could make a big difference
      My Computer

  4. Posts : 24
    Windows 10 Pro
    Thread Starter

    Both discs were bought at the same time and setup exactly the same. They ran forever identically but just differed recently. I'll try to paste a cropped Disk Management snapshot below?

    Free space on a hard drive has got corrupted, HELP-image.png

    I generally copy things to S: and once every couple of weeks sync R: to S:

    I had considered RAID mirroring the 2 discs but, because my PCIe SATA card was new I didn't have confidence with it's RAID routines.

    The discs have worked perfectly for about 19 months. I AM computer literate though not an expert. Have been programming for over 40 years :)

    As you see there is about 6Tb information so I can't just format the disc and re-copy everything back to it. This is a solution I maybe forced to adopt!?

    Thanks for your replies :)
      My Computer


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