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Path: utzoo!watmath!clyde!burl!ulysses!allegra!princeton!rocksvax!dave
From: dave@rocksvax.UUCP (Dave Sewhuk)
Newsgroups: net.micro.mac
Subject: HFS on MacSCSI?
Message-ID: <1717@rocksvax.UUCP>
Date: Mon, 6-Jan-86 21:27:18 EST
Article-I.D.: rocksvax.1717
Posted: Mon Jan  6 21:27:18 1986
Date-Received: Wed, 8-Jan-86 05:59:45 EST
Distribution: net
Organization: Xerox: Henrietta, NY
Lines: 38

Has anyone out there in net land made this work?  I am still patiently
waiting for my developers package I ordered last month, but in the
interim I obtained a copy of the Hard Disk 20 system disk.  I have
looked at what block #2 has in it and tried to emulate all I saw.
When I set it up like the old file sys, zero out the disk and write block 
with volume info, I get the Sys Bomb 27 (your directory is mangled message).

I thus far have tried to emulate that floppy HFS disk as far as I could.
    1) I duplicated block 2 (except for volume name kept to the same length)
    2) Put the $FFFF at beginning of block 3
    3) Copied the magic numbers in block $A
    4) Copied the beginning of the directory block $B and the stuff in it.

All that and it still refuses to mount.

I then tried to use the old format vol info block and mounted the drive
OK.  I added the format and check control functions to re-write the 
vol info block and zero out the rest of the drive.  I picked "Erase Disk"
and found that it re-wrote the vol info block as expected and crashes when
done with Sys Bomb 27.  Clearly the HFS want more written on the disk
before it will manage it but what?

I guess the next thing to do is do some FSReads and FSWrites to copy that
floppy to the hard disk and see if that will coax the drive into mounting!!

Anyone got any ideas what to do next?

Dave

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-- 
Dave

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