Disk Space Is Unavailable and Unviewable

Hello,

I have several 2TB drives which contain largely video and which I backup to other 2TB drives, so that they should be exact copies of each other.  However, the amount of disk space differs dramatically between the original and the copy.  In the worst case, the original drive has 864GB free  while the copy has only  724GB.  I've done disk checks, emptied all the temporary files and virus checked them to death.  The actually number of files and cumulative size as reported by the backup utility shows the disks to be exactly the same.

Can anyone figure out what might be going on?

Thanks,

Peter
Peter044Asked:
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Sergsystem administratorCommented:
Try to erase recycle bins, defragment both disks and then run, for example, FolderSizes http://www.foldersizes.com/index.htm or FreeFileSync http://sourceforge.net/projects/freefilesync/
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Sergsystem administratorCommented:
Which file system, what cluster size?
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Peter044Author Commented:
All are NTFS.  Where do I find the cluster size?

Peter
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Sergsystem administratorCommented:
run this command: fsutil fsinfo ntfsinfo C:

Replace the C: with the letter of the drive you want to check.
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Peter044Author Commented:
Hi Netty,

I'm not sure how to do that.   When I bring up a CMD window, it says I need administrator privileges, which I have.  I'm assuming I need to explicitly run the command as an administrator, but don't know how to do it from a CLI.

Running it in the "search program files" box above the windows icon opens a window to briefly for me to read it.

In general, I don't understand why I am constantly asked for administrator privileges when I've given them to myself.  Any ideas there?

Thanks,

Peter
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Sergsystem administratorCommented:
In general, I don't understand why I am constantly asked for administrator privileges when I've given them to myself. - UAC by Microsoft.

Running it in the "search program files" box above the windows icon opens a window to briefly for me to read it. - write "fsutil fsinfo ntfsinfo C: > C:\ntfsinfo.txt" and then look at C:\ntfsinfo.txt file. Or read the "Run a Command as Administrator from the Windows 7 / Vista Run box" http://www.howtogeek.com/howto/windows-vista/run-a-command-as-administrator-from-the-windows-vista-run-box/
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Peter044Author Commented:
Cluster size is 4096 bytes
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Sergsystem administratorCommented:
On both discs?
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Peter044Author Commented:
Yes.
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Peter044Author Commented:
OK, that was really useful.   I did as you suggested and when I ran foldersizes, I can see into the Recycle Bin, even though I just emptied it.  On one of the drives, there is a folder in the recycle bin that is 188 Gb, which is the difference I couldn't see.  Why does the Recycle Bin show empty on Disc Cleanup, but have all these files in it that I can see with foldersizes?
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Sergsystem administratorCommented:
I dont'n know, may be it was "hidden"...
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Peter044Author Commented:
That's really weird.  Anyway, all is well.  Thanks very much for your help,

Peter
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Peter044Author Commented:
I was able to view and delete files in the Recycle Bin that invisible previously.
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