Thanks to each of you. This is a thread that I wish I could have pulled before it got "on the air". The box clearly stated that the FreeAgent was formatted for Windows and Vista - Duh! Two geeks at Best Buy AND me did not think to check that. I returned it and got a "My Book" formatted for Mac OSX. Wallah! It copied and pasted from the Cavalry without a hitch. The "My Book" is back in the box and tucked away as that extra back-up that we should all have. With the Raid-1 Calvary and the el-cheapo "My Book" I think the library is safe. Thanks Again - Don't I feel like an Audiofool.
Transfer of Library to a back-up External HD
My iTunes library (about 500 gigs) is loaded on a Raid-1 Cavalry external HD. In an attempt to get additional back-up I purchased a new FreeAgent Desk 1 TB external HD. The Mac recognizes both HDs, however when I attempt to click and drag from the Cavalry to the FreeAgent the response on the monitor is, in so many words, the transfer can not be completed because the FreeAgent cannot be modified. This was supposed to be super simple according to the Geek at Best Buy. Am I doing something wrong here? The Cavalry is connected to the Mac via Firewire, the FreeAgent is connected via USB.