Somebody knows why the sectors of the IBM floppy disk are named 1 to 8 (and not 0 to 7 )

Posted by Olivier Briand on Super User See other posts from Super User or by Olivier Briand
Published on 2012-04-01T21:43:17Z Indexed on 2012/04/01 23:33 UTC
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floppy-disk-drive

I am now programming on a 8 bits Z80 computer with CP/M 2.2, (as a hobby) and the floppy disk format is IBM, 40 tracks, 8 sectors per track, 512 bytes per sector. free space is 154 Ko on each face of the disk.

Why the sectors are indexed 1 to 8 (and not zero to seven, as usually is seen with computers)?

The catalog of the floppy disk is on the track 1 (sector 1 to 4, 64 entries).

I'm wondering is the catalog on track zero?

Is the zero track reserved to included a system (as track 0 & 1 are reserved to the system on a CP/M floppy disk, and catalog is on track 2)?

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