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From: lcline@sequent.UUCP (Larry Cline)
Newsgroups: comp.sys.amiga.tech
Subject: Re: what track is disk directory on 3.5" disk?
Message-ID: <49424@sequent.UUCP>
Date: 28 Dec 90 18:44:31 GMT
References: <90339.140456IO00844@MAINE.BITNET>
Reply-To: lcline@crg8.UUCP (Larry Cline)
Organization: Sequent Computer Systems, Inc
Lines: 16

In article <90339.140456IO00844@MAINE.BITNET> IO00844@MAINE.BITNET (Zero Batzell) writes:
>Forgive my ignorance, but I just upgraded to an Amiga. I know the disk director
>y is on track 18 on a 5.25" disk, but WHERE is the directory on a 3.5" disk?
>I'm also interested in any other interesting information having to do with the
>internals of 3.5" disks (just when you get familiar with something...it's time
>to upgrade).                                         Thanks (((ZERO)))

The Amiga does not use tracks for the disk directory.  It uses blocks.  The
root block tends to be in the middle of whatever device you are using.  On
a 5 1/4 inch disk which has 880 blocks the root block is at 440.  On a
3.5 inch disk which has 1760 blocks it is on block 880 (which is normally
on track 40).  On my 380 MB Maxtor it is around block 330000.  If you are
looking to examine the blocks and such you might look into a utility such
as DiskX or Sectorama to do this for you.

Larry