Few more great writeups: https://map.grauw.nl/articles/low-level-disk/ https://map.grauw.nl/articles/low-level-disk/ https://www.unige.ch/medecine/nouspikel/t

Few more great writeups: https://map.grauw.nl/articles/low-level-disk/ https://map.grauw.nl/articles/low-level-disk/ https://www.unige.ch/medecine/nouspikel/ti99/disks.htm https://www.unige.ch/medecine/nouspikel/ti99/disks.htm https://scarybeastsecurity.blogspot.com/2021/05/recovering-lost-treasure-filled-floppy.html https://scarybeastsecurity.blogspot.com/2021/05/recovering-l... and my own contribution https://github.com/raszpl/sigrok-disk https://github.com/raszpl/sigrok-disk decoder for viewing floppy/hdd tracks in nice GUI using $5 logic analyzers like https://sigrok.org/wiki/Lcsoft_Mini_Board https://sigrok.org/wiki/Lcsoft_Mini_Board or https://github.com/gusmanb/logicanalyzer https://github.com/gusmanb/logicanalyzer