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Disk Space Is Unavailable and Unviewable

Posted on 2012-04-04
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Last Modified: 2012-06-21
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
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Question by:Peter044
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Expert Comment

by:Netty
ID: 37808911
Which file system, what cluster size?
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Author Comment

by:Peter044
ID: 37809385
All are NTFS.  Where do I find the cluster size?

Peter
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Expert Comment

by:Netty
ID: 37809509
run this command: fsutil fsinfo ntfsinfo C:

Replace the C: with the letter of the drive you want to check.
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Author Comment

by:Peter044
ID: 37809700
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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Expert Comment

by:Netty
ID: 37809707
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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Author Comment

by:Peter044
ID: 37814724
Cluster size is 4096 bytes
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Expert Comment

by:Netty
ID: 37814749
On both discs?
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Author Comment

by:Peter044
ID: 37814836
Yes.
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Netty earned 500 total points
ID: 37826257
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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Author Comment

by:Peter044
ID: 37826661
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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Expert Comment

by:Netty
ID: 37833554
I dont'n know, may be it was "hidden"...
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Author Comment

by:Peter044
ID: 37835112
That's really weird.  Anyway, all is well.  Thanks very much for your help,

Peter
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Author Closing Comment

by:Peter044
ID: 37835113
I was able to view and delete files in the Recycle Bin that invisible previously.
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