I just purchased a 500 GB Toshiba Canvio 3.0 USB Drive (one of those usb-powered portable 2.5" drives). Initially, Windows reported its size as 465 GB, with about 458 free.
My primary hard drive is 420 GB w/ just < 400 GB used. I'm using Cobian Backup to copy everything from the primary drive over to the USB drive.
After copying about 260 GB of data, Cobian started reporting on every file that the disk was full.
I checked and sure enough, Windows is reporting "465 GB Used" and "0 bytes free"!
Yet when I view the drive's contents, selecting all the files/folders at the root level, Windows tallies up the contents at only about 260 GB!
There's nothing in the Recycle Bin, and I'm including all "hidden" and "system" folders in the total... so where did my other 200 GB of storage go?? Why the contradiction here??