prindle@nadc.ARPA (10/29/86)
The Digital Research documentation on CP/M would seem to indicate that these are the variables (the BDOS cares about) among different 5.25" MFM diskette formats: . physical sector size . number of physical sectors per track . number of tracks on diskette . allocation unit size . number of directory entries . number of reserved system tracks . number of checksummed directory entries Furthermore, the BIOS will undoubtedly need these facts: . origin of physical sector numbering on each track (0 or 1) . track numbering philosophy of physical sectors on a double sided disk: - both sides considered one track - even tracks on side 0, odd tracks on side 1 - first half of tracks on side 0, second half on side 1 - something even more bizarre Are there any other parameters which are necessary to describe diskette formats? For example, are there variations within the format of a physical sector itself (number of syncs between header and data, checksumming technique, etc)? Thanks in advance, Frank Prindle Prindle@NADC.arpa
michaelk@copper.UUCP (Michael Kersenbrock) (10/31/86)
There also is the interleave factor (physical to logical sector number mapping) that will vary from disk to disk. -- Mike Kersenbrock Tektronix Computer Aided Software Engineering Aloha, Oregon