Well, that is a commono misunderstanding.
1. Your 500GB (decimal) capacity shows as 465GB (binary) in the system.
2. To get a true count of all the files run WinDirStat ( 'WinDirStat -
Windows Directory Statistics' (http://windirstat.info/
) ). Only than you
will have a true count.
3. Finally, up to 15% of your OS partition is used for shadowstorage -
and that you do not see in the above. For a better understanding I have
made this write-up:
With each install and uninstall, Vista writes a shadow (restore point)
of about 1GB - plus one is written each day. For that purpose Vista
reserves 15% of your OS disk partition and allocates/uses it as needed.
Find Command Prompt (in All Programs > Accessories > Command Prompt),
right click on it and Open as Administrator. Into the little black
window type VSSADMIN LIST SHADOWSTORAGE and hit ENTER. It will show 3
Allocated - that is the amount that it has grabbed from your OS
partition at this time
Used - this is the amount currently used
Maximum - this is the ultimate amount it will allocate and use
Once you reach "maximum", it will reuse the space deleting the oldest
shadows for the storage of the newest shadows. With e.g. an appr. 200Gb
of OS partition you should expect a maximum of 30GBs that are reserved
for the system and that you cannot use. If your OS partition is larger
or smaller, the shadowstorage will be accordingly (always 15% max.) But
the restore points (shadows) are required the day you need to do a
PS: If you need to reduce the amount of shadowstorage ( which I do not
recommend), you find the procedure here: