Fa3ien wrote:
> Our server got a 120 Gb disk.
> 
> Data files are stored on a 100 Gb partition of it.
> That partition is NTFS, cluster size 4 Kb.
> 
> The files in that partition sums up to 40 Gb (which,
> not surprisingly, is also the size of the nightly
> backup)
> 
> Today, someone had a problem to save a file, and I've
> been horrified to see that Windows Server 2003 tells
> me there's only 2 Mb left on the partition !
> 
> I've run a defrag, which freed 250 Mb.
> 
> WHERE IS THE REST ? (there should be 60 Gb free !)
> 
> What could it be ? I don't know what to do...

Some of it could conceivably be "slack space". (A file can only be an 
integer number of blocks long. The remaining space isn't shown in the 
"file size", yet cannot be used for any other data because a block can 
only belong to one file. If you look at file properties, you will see a 
"file size" and a larger "disk on disk", which includes the slack space.)

Some more of it could be for the directory structure. (Directories take 
up space too!)

If you have vast numbers of really tiny files, that might well eat up a 
lot of free size without registering as much "used space". (IIRC, 
*really* tiny files get inlined into the directory structure itself to 
reduce slash space. I forget what the size limit is though.)

Met more of it might be things like reversed file allocations (rare), 
MTF (master file table), System Volume Information, Restore Points, etc.

Do you have that Previous Versions option switched on?

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