>I have a WD Elements 2TB USB hard drive. I would like to >encrypt the whole drive with TrueCrypt on my CentOS box. >Could someone direct me to a tutorial on how to do this? >Ideally, I would also like to access it with my WinXP box, >but this part is optional. Truecrypt is platform agnostic, see the FAQ. As for instructions see their tutorial: http://www.truecrypt.org/docs/tutorial What you will need to do is use a file system that both OS's can read/write to.