I recently purchased a bunch of used MD's from E-BAY a & when I tried to erase some of them to reuse the message "TR PROTECTED" came up. I was not able to ease the MD so I could use it again. What I want to know if there is any way I can erase these MD's for reuse or are they junk only fit for the garbage pile? I have a Sony home NETMD unit. Thank you for your help. Lew.