Physical Disk Layout for the 1540/1541
The 1541 disk drive used 5.25" disks. The standard CBM DOS format is 170 KB with 35 tracks and 256-byte sectors providing 165K for storage.
Although standard disks are only 35 tracks, it was mechanically possible to get 40 tracks by using either custom formatting or third party DOS's.
Directory track 18
Directory track 18 sector 0, the BAM and disk details
How files are stored on the disk
CBM DOS as a single image for Emulators
Making a disk bootable on the C128
GEOS VLIR (Variable Length Index Record)