Subject: Re: Disk format
Path: lobby!newstf02.news.aol.com!portc01.blue.aol.com!news-peer.gip.net!news.gsl.net!gip.net!sunqbc.risq.qc.ca!news.uow.edu.au!david
From: david@uow.edu.au (David Wilson)
Newsgroups: comp.sys.apple2,comp.sys.apple2.programmer
Date: 10 Feb 99 23:14:09 GMT
Organization: University of Wollongong, Australia
Lines: 25
Message-ID: <david.918688449@wraith>
References: <79sue8$ad6$1@platane.wanadoo.fr>
NNTP-Posting-Host: wraith.cs.uow.edu.au
X-Trace: wyrm.its.uow.edu.au 918688472 11911 130.130.64.1 (10 Feb 1999 23:14:32 GMT)
X-Complaints-To: usenet@wyrm.its.uow.edu.au
NNTP-Posting-Date: 10 Feb 1999 23:14:32 GMT
X-Newsreader: NN version 6.5.0 #15 (NOV)
Xref: lobby comp.sys.apple2:79547 comp.sys.apple2.programmer:9178



"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