I have never used any software like Eraser 5.7, but hope it can remove all data from my slave (2nd) hard drive, as I will soon be receiving a new base unit any day now, and hope to incorporate this hard drive also as a slave in my new system. However, is it possible for me to do this using my existing system, i.e. prior to fitting it to the newer system, and without (very important) erasing data from the master in my present system? Also, can I safely download Eraser 5.7 into the system without it going ahead with any erasing, e.g. does it have to be properly downloaded and installed before any erasing takes place? Sorry if I sound paranoid!