TD_GETNUMTRACKS

return the number of tracks for the type of disk drive for the unit that was opened.

This command returns the number of tracks that are available on the disk unit. Note that this command returns the number of cylinders (80 for a 3.5" drive, 40 for some 5.25" drives) and not the number of tracks. The number of tracks would be twice the number of cylinders.

io_Device

preset by the call to OpenDevice()

io_Unit

preset by the call to OpenDevice()

io_Command

TD_GETNUMTRACKS

io_Flags

0 or IOF_QUICK

io_Error

0 for success, or an error code as defined in <devices/trackdisk.h> or <exec/errors.h>

io_Actual

if io_Error is 0 this contains the drive type connected to this unit.

TD_GETDRIVETYPE