Just in case there was any doubt; Andreas' dd disk images Just Worked (tm) Evidently Altos' Diags & OS disks uses a 512 byte block, or multiples, because I think he ripped the images without a specified block size. 3M DS,DD 360K floppies formatted fine as "/dev/fd1h720" on a plain old combo drive (1.44 3.5" & 1.2 5.25 in one), brand long forgotten. The CMI hard disk is dead as nails. My boss is gonna be an irritated S.O.B in the morning. I know we've got some ST225 drives, and for hard drives, he generally charges me $.01/MB.... :^) More fun than one man's allowed. Doc