Re: Disk format

["me" <dontmail@all.org>]

i'm interested..
..how is the data actually encoded on the disk?
I have a brief text file somewhere about 4-4 and 6-2 encoding, but i found
it to be only minutely helpful.

I ask because i have an external 3 1/2  floppy, but it's meant for an IBM
compatible.  So i'm thinking of wiring up a new card to stick in one of the
empty slots of my //e and perhaps (if necessary that is) write a program for
reading files off the disk.

If anyone suggests that i just buy an apple // floppy, i want to state that
requires money and time, both of which i'm trying to conserve.  At least..
..i'm trying to covserve time hunting. I don't mind spending time tinkering.

So -- in summary -- any and all info you have about how the information is
placed on a disk would be helpful.

thanks..

~b



David Wilson wrote in message ...
>"Aurelien Mere" <amere@multimania.com> writes:
>>Does anybody know the disk format of 3"5 apple II disks ?
>>I mean : number of sectors, tracks, bytes/sectors, heads, etc...
>
>It is the same (well almost) as the Mac:
>
>80 tracks
>2 heads
>512 bytes/sector (Mac has extra 12 bytes for flags, Apple // has zeros)
>Variable number of sectors per track
>
>For a single sided disk:
>
>        Tracks  Sectors/Track   Sector #s
>        0-15            12        0-191
>        16-31           11      192-367
>        32-47           10      368-527
>        48-63           9       528-671
>        64-79           8       672-799
>
>I assume that for a double sided disk you just double the sector numbers.
>
>See Inside Macintosh Volume II, chapter 7.
>--
>David Wilson  School of IT & CS, Uni of Wollongong, Australia
david@uow.edu.au