While I cannot help you with the catweasel northstar project, I do know that at least the linux cwtool toolkit is missing a number of disk definitions which are very useful and common. It does NOT normally support: SSDD 5.25 8 sectors/track 160k SSDD 5.25 9 sectors/track 180k DSDD 5.25 8 sectors/track 320k SSHD 3.5 18 sectors/track 720k <- very unusual format SSHD 5.25 15 sectors/track 600k I produced some simple definitions for these 5 modes (by hacking the msdos_dd_5.25 definition, which is DSDD 5.25 9 sectors/track) which will work for reading but are probably not good enough for correctly writing the disks owing to timing differences. Please email me if you want them. It DOES support: msdos_dd which is DSDD 3.5 9 sectors/track 720k msdos_hd which is DSHD 3.5 18 sectors/track 1440k msdos_dd_5.25 which is DSDD 5.25 9 sectors/track 360k msdos_hd_5.25 which is DSHD 5.25 15 sectors/track 1200k and a number of extended msdos_hd modes which use extra tracks and other tricks to achieve the following sizes: 1476k (82 tracks) 1494k (83 tracks) 1600k (20 sectors/track) 1680k (21 sectors/track) <- DMF format used by Microsoft for Win95 disks, among others 1722k (82 tracks, 21 sectors/track) 1743k (83 tracks, 21 sectors/track) 1760k (11 sectors/track, 1024 byte sectors) 1802k (82 tracks, 11-19 variable sectors/track, 1024 byte sectors) a couple variations of those are missing too: (82/83 20 sectors/track; 82/83 11 sectors/track 1024 byte sectors; 80/83 11-19 variable sectors/track 1024 byte sectors). It does not support the 1880k 2m or 1992k fdutils formats. It also supports a number of commodore, amiga, atari, and apple/mac modes, though probably not all of the possibilities. It also does not support the Sirius 1/Victor 9000 9-speed/rate-zone GCR 5.25 format, which probably will require adding an entirely new GCR mode to the source code. Both single and double sided versions of this exist. I can only test the single sided versions because head 1 is inoperable (blown/open? needs further testing, doesn't seem to either read or write) on my Victor 9000. I have not even attempted to write a definition or GCR code for this yet, and could use any assistance available. My goal is to get ALL of this stuff supported by the cwtool catweasel driver eventually. OP: Sending the original request message 3 times was unnecessary. -- Jonathan Gevaryahu jgevaryahu(@t)hotmail(d0t)com jzg22(@t)drexel(d0t)edu