I have had some formating problems on PPC macs and 800k disk. The format seems to work, but the disk is usually unreadable in an older 800k drive (1.4mb drives seem ok). Reading and writing to a preformatted 800k disk has never been a problem. So I either format a disk in an older non PPC machine, or I also have a blank 800k disk image that I can copy to a disk, that always seems to work fine (the image was created off a disk that was formatted on a non PPC mac). 400k is a totally different issue. A: I believe the drives themselves may be incapable of working with 400k, but more importantly B: starting with OS 8.0 (I think it was 8.0), MFS file support was dropped. No MFS, no 400k disks. 800k disks use HFS so there isn't a problem there. Of course, I keep a handy dandy LC kicking around for just this very issue (the LC connects nicely to my ethernet network, and runs 7.1 so it will read and write 400, 800, 1.4mb, DOS and ProDOS disks, giving me access to all of the above on my iMac). -chris <http://www.mythtech.net>