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Newsgroups: comp.sys.apple2
Subject: Re: SyQuest and HFS FST
Message-ID: <1992Nov20.070646.2159@actrix.gen.nz>
From: David.Empson@bbs.actrix.gen.nz
Date: Fri, 20 Nov 1992 07:06:46 GMT
Sender: David.Empson@actrix.gen.nz (David Empson)
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In article <9211180616.AA16897@chasm.scar.utoronto.ca> 90taobri@CHASM.SCAR.UTORONTO.CA (Brian Tao) writes:
> 
>     Since Syquests have a SCSI partition map, I assume the problem is
> the same one preventing an HFS hard disk formatted on a GS from working
> on a Mac.  You need some sort of special partition with Mac-specific
> data for it to be recognized.  The GS doesn't need it (and doesn't put
> it on).

If a SCSI drive is formatted on a IIgs and is not partitioned, the
drive will be unusable on the Mac.  If it has been partitioned, the
Macintosh still can't access it unless there is a Macintosh SCSI Driver
for the drive, in its own partition.

Advanced Disk Utility installs the driver in the case of Apple-branded
drives, but not for non-Apple drives, unless you make a copy of ADU in
your */System/Drivers directory and rename it to GenericMacSCSI.

However, even this won't work, because the driver supplied with ADU
doesn't know about removable drives, so the Mac will get confused if
the SyQuest is ejected.

>The reverse may also be a problem:  the Mac partition confuses GS/OS somehow.

Definitely not.  The IIgs and Mac use the same partitioning mechanism.

Formatting the drive on the Mac _should_ allow it to be read by both
computers.  There must be some other problem.
-- 
David Empson

Internet: David.Empson@bbs.actrix.gen.nz    EMPSON_D@kosmos.wcc.govt.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand
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From: jmk3@crux3.cit.cornell.edu (Jay Krell)
Subject: Re: Advantages to HFS drives?
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Date:  6 Aug 93 03:24:29 GMT
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>Not off-hand.  My main concern with HFS volumes is the lack of disk
>recovery software should something go wrong.  You can't use the
>Macintosh-based utilities unless the drive has a Macintosh device
>driver installed, and A.D.U. doesn't put one on there unless it is an
>Apple drive.
 
It is fairly easy put the Apple SCSI driver on any (3rd party)
device. You use Derez to extract the driver and another
resource from ADU, change the IDs, Rez it, and name it

 
Is anyone interested in a simple app to perform this?
(The file can't legally be distributed.)

--
  --Jay, jay.krell@cornell.edu
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From: jmk3@crux4.cit.cornell.edu (Jay Krell)
Newsgroups: comp.sys.apple2.programmer
Subject: how to format HD for Mac with ADU
Date: 18 Apr 1994 23:57:56 GMT
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For all you IIGS programmers with Rez, Derez, hard drives you want to use
on a Mac, with no good enough Mac formatter, and without the System 6
CD, I know you're a huge group, here's how to make an unauthorized
not generic GenericMacSCSI driver for Advanced Disk Utilities (Sys 6/6.0.1).
 
derez -only 0x4D61 /hd2/apps/adv.disk.util >big
derez -only 0x5E72 /hd2/apps/adv.disk.util >small
 
Combine the "big" and "small" files. Compile with Rez. Name 
the file GenericMacSCSI and put it in System:Drivers.
 
This is an abuse of the driver, but it has worked for me
on Syquest cartridges on a few Macs (LC, II, Outbound (Plus) and
on Quantum 40 and 100 MB ProDrives on the Outbound.

--
  --Jay, jay.krell@cornell.edu
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From: bpvh@shell1.msn.fullfeed.com (Bradley VonHaden)
Newsgroups: comp.sys.apple2
Subject: IIgs and BIG HDs, was re: LaCie drives
Date: 21 Aug 1995 05:09:47 GMT
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dempson@atlantis.actrix.gen.nz (David Empson) wrote:

>Further to this: I'm in the process of buying a Quantum
>Trailblazer 850MB SCSI drive.  I'll post again regarding its
>compatibility with the IIgs (Apple HS SCSI card) once it gets
>here.
>
>I wonder how I'll partition this monster?  My current thought is
>six 32MB ProDOS partitions and one or two HFS for the rest (my
>current Quantum 240MB has four 32MB ProDOS and the rest as a
>single HFS partition).

I gleaned the following from Genie.  Supposedly, more than 20
(according to Sys 6.0 Manual, p 233, 32) partitions can be created.
As I only have a 240 mb hd, I can not test out the following:

HAROLD.H [Hdwr Hacker]

1) Fire up ADU (with the generic Mac driver in the drivers folder of
     the current boot volume as GenEx placed it)

2) Select the Partition option in ADU

3) Select a partition, and then delete it. Do this with each existing
     partition. You won't be able to delete the last one however.

4) Make the final remaining partition as small as ADU will let you.

5) Click on the "Partition" button. ADU will ask you if you want to
     "hard format" (low-level) the drive. Answer YES. After the low
     level formatting is finished ADU will ask you about wanting to
     use the drive on a Mac, answer YES.

6) You should now be able to create (within reason) as many new
     partitions as desired.

A trick that might explain why I didn't have problems... I created
the new partitions at the smallest size that ADU would permit,and
then went back thru each of them adjusting their sizes to 32.0Mb.
(maybe if you initially create them at 32Mb ADU limitsyou to 8?)

 -Harold