question on HD storage.

[Fiveohhh]

I have a question. I have a 160gb drive here that I was backing up to another drive. When I right clicked the disk and went to properties it said there was 152 total and 100 free, and 50 or so used, so I cleared up 50 gigs on the other drive, but when I copied all the file in the drive over there was only 30gb. Why is there a 20 gig descripency(sp) between when I grab all the folders in the root, and when I get the properties from the drive?

I have this in the general HW , but kinda need an answer fast and not getting one there

 

[BlamoHammer]

This should help

 

[Dufman]

check for hidden files and folders

 

[Fiveohhh]

checked that there are only about 400 megs worth anyways, I kinda wanna delete the folders I backed up, and see if the storage goes down to 0, but not sure if there is something I'm missing(ya'd think you would know if you were missing 20 gbs)