Atari ST disks are standard MFM encoded IBM scheme disks without an IAM header. Disks are typically formatted 512 bytes per sector with between 9-10 (sometimes 11!) sectors per track and 80-82 tracks per side.
For some reason, occasionally formatting software will put an extra IDAM record with a sector number of 66 on a disk, which can horribly confuse things. The Atari profiles below are configured to ignore these.
Be aware that many PC drives (including mine) won't do the 82 track formats.
- Format variants:
360: 360kB 3.5" 80-track 9-sector SSDD370: 370kB 3.5" 82-track 9-sector SSDD400: 400kB 3.5" 80-track 10-sector SSDD410: 410kB 3.5" 82-track 10-sector SSDD720: 720kB 3.5" 80-track 9-sector DSDD740: 740kB 3.5" 82-track 9-sector DSDD800: 800kB 3.5" 80-track 10-sector DSDD820: 820kB 3.5" 82-track 10-sector DSDD
To read:
fluxengine read atarist --360 -s drive:0 -o atarist.imgfluxengine read atarist --370 -s drive:0 -o atarist.imgfluxengine read atarist --400 -s drive:0 -o atarist.imgfluxengine read atarist --410 -s drive:0 -o atarist.imgfluxengine read atarist --720 -s drive:0 -o atarist.imgfluxengine read atarist --740 -s drive:0 -o atarist.imgfluxengine read atarist --800 -s drive:0 -o atarist.imgfluxengine read atarist --820 -s drive:0 -o atarist.img
To write:
fluxengine write atarist --360 -d drive:0 -i atarist.imgfluxengine write atarist --370 -d drive:0 -i atarist.imgfluxengine write atarist --400 -d drive:0 -i atarist.imgfluxengine write atarist --410 -d drive:0 -i atarist.imgfluxengine write atarist --720 -d drive:0 -i atarist.imgfluxengine write atarist --740 -d drive:0 -i atarist.imgfluxengine write atarist --800 -d drive:0 -i atarist.imgfluxengine write atarist --820 -d drive:0 -i atarist.img
-
Atari ST Floppy Drive Hardware Information by Jean Louis-Guerin
-
Atari ST Floppy Drive Software Information by Jean Louis-Guerin