On Fri, 8 Feb 2002, Jonathan Engdahl wrote: RX50's came pre-formatted from DEC. There was never a way to format them on PDP's or VAX as far as I knew. I do think it is possible to create them using PUTR and an old PC with a proper floppy controller and a 1.2M floppy drive configured the right way. My understanding is they are 80 track, 96 tpi format but spin at the slow spead of normal 5.25 disks and not the higher speed used by IBM HD disks. As a curious note, I actually had (and may still have in the attic somewhere) a real shugart 80 track 5.25 drive that would have been the equivalent of an RX50, so it was not only DEC who used that format. I had them on a TRS-80 and NewDOS-80 and DOSPlus had no problems formatting and using the drive. This was long before my first PDP, but I now wonder if they would have been able to read and write (and maybe even format!) RX50's. bill -- Bill Gunshannon | de-moc-ra-cy (di mok' ra see) n. Three wolves bill(a)cs.scranton.edu | and a sheep voting on what's for dinner. University of Scranton | Scranton, Pennsylvania | #include <std.disclaimer.h>