Thanks a lot everyone. I think I am sorted now. Main copy will definietely be WAVs created with a good package that will try to duplicate the sound exactly and then copy them to MP3, using a higher bit rate, when I want a car copy.

Joe - You may just want to mirror your partition to another disk. That way you don't have to worry about copying as anything you write will be written to both disks. It will slow writes down a little, unless you have a massive memory cache, but it will speed up reads because it can use both disks. I beleive Windows 7 has it's own mirroring utilities. Plenty URLs refering to it including this one.

If, however, you have a new-ish PC with onboard RAID features you may want to consider mirroring via that or, if you can put 3 or 4 disks in, use RAID 5 instead of mirroring which will give you some security without using as much disk space as mirroring (RAID 1).

Any of our in-house mudcat techies would be happy to help, I'm sure.

Dave