I've seen this on a couple of external HDD's and it's starting to get annoying. Win XP Pro using WD 320 GB drive formatted to NTFS in external case (USB/firewire combo). Indexing, compression, quota, and write caching all turned off. Properties on drive shows 294 GB used and 3.67 GB free. Properties on all folders and files in the root folder: 314,389 files, 33,353 folders, Size = 290GB (311,668,217,993 bytes) , Size on disk = 280 GB?!?!?!?!?!? (301,374,960,377 bytes). How does the size on disk get smaller than the sum of the file sizes?!?!?!?! It's ALWAYS the other way around due to incomplete filling of clusters at the end of files.
Deleted about 5 GB of files using Shift-Delete (meaning I REALLY want these files deleted, not moved to the recycle bin) and expected to see around 8 GB free. No change to free space. I move this drive around between several computers and can't be sure which computer was originally used to partition and format it.
WTFITS??? BLEEPING COMPUTER!!!!!!!!!!!!!!!