Both 320k (8 sectors/track) and 360k (9 sectors/track) were used in a number of MS-DOS systems in the early 80's, and it's quite possible that any given MS-DOS implementation will support both of them and will properly recognize which way a disk is formatted through parameters in either the FAT or the boot sector. ---------- From: Don Maslin [SMTP:donm@cts.com] Sent: Monday, December 14, 1998 6:34 AM To: Discussion re-collecting of classic computers Subject: Re: Comterm Hyperion - Boot disk? On Mon, 14 Dec 1998 Innfogra(a)aol.com wrote: No, it is 8 sector instead of 9 sector disk format. The drives are no different! - don donm(a)cts.com *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives Chairman, Dina-SIG of the San Diego Computer Society Clinging tenaciously to the trailing edge of technology. Sysop - Elephant's Graveyard (CP/M) Z-Node 9 - 619-454-8412 *--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--* see old system support at http://www.psyber.com/~tcj visit the "Unofficial" CP/M Web site at http://cws86.kyamk.fi/mirrors/cpm with Mirror at http://www.mathcs.emory.edu/~cfs/cpm