Hi I had some window problems reported elsewhere and since they not be resolved, decided to completely reinstall XFCE.
Before doing so I backed up everything from my daughters login session which were picture files, music and work. Then unmounted and removed the USB 500Gb Seagate drive.
After reinstalling XFCE I plugged in the drive expecting to see the same directory structure that I copied previously. Only one directory exists, and its corrupt. The drive is formatted as NTFS which I understood was handled by XFCE; it had been mounted, and the copy progress and check was good.
Unfortunately, same thing happened with my FAT formatted pendrive a month previous; after file copy, the files were gone forever! Hence the reason I used my external USB hard drive which has always been robust.
I dunno, maybe its me, but I am having a lot of bother with XFCE; if others have similar problems with data being lost corrupt then please add to this thread.