I have a Maxtor external usb drive mounted to my home network using a Linksys NSLU2 network storage link. I have deleted all the files on it and want to erase the unused disk space before using truecrypt. Windows XP is my operating system, and I was backing it up to the Maxtor using retrospect before this. Anyway, when I run eraser, the network drive does not show up in the unused drive list even when I mount it through windows explorer. What can I do?