Strange used/free space and number of files reporting using chkdsk

[allen2]

I was doing some tests on ntfs hardlinks and run chkdsk and chkdsk /f and chkdsk /R on a mounted partition not the C: but a copy of it (i did those tests in a VM and i copied the virtual drive containing C: partition):

- chkdsk without option doesn't report the same numbers than a chkdsk /f and chkdsk /r.

chkdsk:

  41940991 KB total disk space.
   9598216 KB in 44358 files.
     36116 KB in 13546 indexes.
         0 KB in bad sectors.
    128503 KB in use by the system.
     65536 KB occupied by the log file.
  32178156 KB available on disk.

      4096 bytes in each allocation unit.
  10485247 total allocation units on disk.
   8044539 allocation units available on disk.

chkdsk /f run right after:

  41940991 KB total disk space.
   7927048 KB in 44357 files.
     36116 KB in 13546 indexes.
         0 KB in bad sectors.
    128499 KB in use by the system.
     65536 KB occupied by the log file.
  33849328 KB available on disk.

      4096 bytes in each allocation unit.
  10485247 total allocation units on disk.
   8462332 allocation units available on disk.

chkdsk /r run right after:

  41940991 KB total disk space.
   7927056 KB in 44359 files.
     36116 KB in 13547 indexes.
         0 KB in bad sectors.
    128499 KB in use by the system.
     65536 KB occupied by the log file.
  33849320 KB available on disk.

      4096 bytes in each allocation unit.
  10485247 total allocation units on disk.
   8462330 allocation units available on disk.

and a last chkdsk:

  41940991 KB total disk space.
   9598228 KB in 44361 files.
     36116 KB in 13547 indexes.
         0 KB in bad sectors.
    128499 KB in use by the system.
     65536 KB occupied by the log file.
  32178148 KB available on disk.

      4096 bytes in each allocation unit.
  10485247 total allocation units on disk.
   8044537 allocation units available on disk.

The reporting of the number of files is almost always the same and i can understand that some process (like indexing) is making in background one or two files between each chkdsk but i have no explaination for the available space with more than 1GB of more free space reported when using chkdsk /f or /r.

Anyone have an idea ?

By the way of is windows 2008 R2 SP1

Reason for edit: added OS

Edited June 21, 2011 by allen2