Since the read and write functions expect a sector number, for systems where the sectors aren't addressed by a logical sector number (e.g. CBM drives), there are 2 conversion functions. One of them converts a logical sector number to a head/track/sector triple. The other conversion function works the other way round.

```
``` unsigned char __fastcall__ dio_phys_to_log (dhandle_t handle,
const dio_phys_pos *physpos,
sectnum_t *sectnum);

This function converts track/head/sector to logical sector number.

```
``` unsigned char __fastcall__ dio_log_to_phys (dhandle_t handle,
const _sectnum_t *sectnum,
dio_phys_pos *physpos);

This function converts a logical sector number to track/head/sector notation.

Note, that on systems which natively use logical sector numbers (e.g. Atari),
the conversion functions are dummies. They ignore head/track
(`dio_phys_to_log`

) or return them as zero (`dio_log_to_phys`

).
The logical sector number is returned as physical sector and vice versa.

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