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.

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>

io_Actual

if io_Error is 0 this contains the number of tracks accessible on this unit

TD_GETDRIVETYPE