Losing Disk space AFTER Defrag

I recently bought a 1TB drive. And swiftly filled it up to 870GB. So I went and deleted 20GB of stuff and decided to defrag it for the first time.

I used Defraggler and I noticed that as I was defragging the drive it was listing my disk space as having less and less space... by the time the defrag finished I only had TWENTY-EIGHT GB LEFT!?

Has anyone ever heard of this or know what might cause this? I was thinking i'd end up with MORE disks pace not 123GB LESS!

thanks...

I forgot to mention that the drive in question (thats filling up) is my E: drive... my secondary drive.

However, Rich, thank you for the advice... I ran disk cleanup and it gave me 40 more GB of space back... I wonder if its possible that WHILE I was defragmenting my drive Windows was also creating an extremely large system restore point on my secondary hard drive. (I do have my computer set to put it on my secondary harddrive however I looked at the date on all the files there today and they all said they were created 5 days ago... I had 120 GB free space yesterday...

What is also weird is that it only gave me 40 GB back... HOWEVER. My C: Drive is about 130 GB FULL. So it might make sense that an entire copy of my drive since the amount lost is the same amount of space.

Does any of that make sense?

I'm still confused cause i'm still missing 80GB... maybe it is a massive restore but thank you for the help!

My biggest concern was that my drive was screwed.. can anyone make sense of this chkdsk report that I got from a scan today while I was out?:

Is this good? bad?

Code:

Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Administrator>chkdsk e: /f /r
The type of the file system is NTFS.

Chkdsk cannot run because the volume is in use by another
process.  Chkdsk may run if this volume is dismounted first.
ALL OPENED HANDLES TO THIS VOLUME WOULD THEN BE INVALID.
Would you like to force a dismount on this volume? (Y/N) y
Volume dismounted.  All opened handles to this volume are now invalid.
Volume label is CoSMoS-1TB.

CHKDSK is verifying files (stage 1 of 5)...
  168704 file records processed.
File verification completed.
  1191 large file records processed.
  0 bad file records processed.
  0 EA records processed.
  0 reparse records processed.
CHKDSK is verifying indexes (stage 2 of 5)...
  184572 index entries processed.
Index verification completed.
  0 unindexed files scanned.
  0 unindexed files recovered.
CHKDSK is verifying security descriptors (stage 3 of 5)...
  168704 file SDs/SIDs processed.
Security descriptor verification completed.
  7935 data files processed.
CHKDSK is verifying Usn Journal...
  687443640 USN bytes processed.
Usn Journal verification completed.
CHKDSK is verifying file data (stage 4 of 5)...
  168688 files processed.
File data verification completed.
CHKDSK is verifying free space (stage 5 of 5)...
  3342041 free clusters processed.
Free space verification is complete.
Windows has checked the file system and found no problems.

 976759807 KB total disk space.
 962392452 KB in 134352 files.
     62840 KB in 7936 indexes.
         0 KB in bad sectors.
    936347 KB in use by the system.
     65536 KB occupied by the log file.
  13368168 KB available on disk.

      4096 bytes in each allocation unit.
 244189951 total allocation units on disk.
   3342042 allocation units available on disk.

I downloaded the one from WD and it wouldn`t run saying something about Cable Error. Whatever that means... I read that false positives were common with WD diagnostic tools