== Vortex Disk Format ==
Sector numbers are 01h..09h (same as AMSDOS IBM Format, but with a 9th sector).Disks are Double-Sided, Double Density, 80 Tracks, 9 Sectors, blocks are allocated in 4K units.Total capacity is 720K (704K available):* First 9K contain two System Tracks (eg. CP/M Bootstrap)* Next 4K contain directory (see Note)* Next 704K are data (allocated in 4K blocks) (aka 4K clusters)* Last 3K are unused (due to 4K allocation size)Note: According to the manual, the directory can hold 128 entries under VDOS2.0 (whole 4K used), but only 64 entries under VDOS1.0 (only half of the 4K area used).See [[VDOS]]
The Vortex -Z drives do not seem to include any [[VDOS]] ROM (so they do support only normal 40-Track AMSDOS Formats, but NOT the 80-Track Vortex format).