code compatibility between normal and geom methods for accessingdisk devices

[Poul-Henning Kamp]

In message <BDENIKJMJKOAJAMDFLDDCECICAAA.plan_b at videotron.ca>, slick writes:

>	I wrote an fdisk program which uses several read(2) and write(2).

You program needs to realize that disks have sectors.  You cannot
read a single byte from a disk at a time, you need to read an entire
sector and pick the byte out you want.

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Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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