Re: Help: ADU and sharing a hard drive between a mac and 2gs

[dempson@actrix.gen.nz (David Empson)]

David. E. Goble <goble@kin.on.net> wrote:

> Hi All;
> 
> I have an external 105Meg Quantum (LP105S 910109405) Ver 3.1 according
> to SCSI Probe 4.3 and a IBM Seagate program.

Is this a "normal" Quantum, or an Apple re-branded Quantum?  (It would
be an Apple one if it was originally supplied as an internal drive in a
Mac, otherwise it is probably a normal one.)

What driver software are you attempting to use on the Mac?
(Possibilities include Apple HDSC Setup, Drive Setup, or third party
drivers such as HDT or Silverlining.)

> I recently got my hands on a MacSE/30 and wanted to partition and
> format the drive so I can connect it to either computer as a boot
> drive, by having one partition as a mac boot volume.

This should be possible.  The main requirement is that the first
partition on the drive must be ProDOS, so the Apple II can boot.  The
Mac should be able to recognise and boot from any HFS partition on the
drive.

One problem you might run into with recent Mac drivers is that they use
a partition type of APPLE_DRIVER43 to store the driver code.  This
partition type is not recognised by the IIgs, and it thinks it is a
foreign file system.  (Finder complains about an unrecognised file
system, and asks if you want to initialize or eject it.)

Older drivers are stored in partitions of type APPLE_DRIVER, which the
IIgs knows about and ignores.  It doesn't matter if these partitions
come before or after the first ProDOS one.

In fact, if you partition a drive with recent versions of Advanced Disk
Utility (System 6.0 and later, I think), it creates four 16K partitions
of this type.  If the drive is Apple branded then it will also put the
standard Apple driver into one of these partitions.  It doesn't do this
for a third party drive unless you do some extra setup.

The APPLE_DRIVER43 partition is for a driver which supports SCSI Manager
4.3, which was a new feature on late model 680x0 Macs (around the
Quadra) and most PowerMac models.  I don't know whether older machines
like the SE/30 would be able to use these drivers anyway.  They might be
able to run SCSI Manager 4.3 by using recent system software, and it
might load the newer driver during startup (after having done the
initial boot with an older driver).

> This is when I found a problem. I tried to repartition the drive using
> the new ADU (ver1.2), after setting up the partitions and pressing the
> partition button, it said; it can not partition the drive. It can
> however format/initialise and zero it...

Hm.  Can you still partition it with older versions?  I don't know of
any reason why ADU would fail to partition the drive.  There could be a
problem with the number of partitions, or attempting to avoid
overwriting something.

Try this: 

- Go into the Partitioning section of ADU.
- Remove all of the partitions.
- Add a single partition filling the entire drive.
- Partition the drive.

If this fails, then I'm stumped.

If it succeeds, then go back and split the single partition into at
least two partitions, with the first one being no larger than 32MB (for
ProDOS).

>  (The drive will not boot on the apple 2gs after being partitioned and
> formatted on the MacSE/30 and having partitioned and formatted it on
> the MacSE/30, I tried booting from floopies with the drive connected,
> but it has a 16k partition that the 2gs wants to either eject or
> initialise. I assume this is why the 2gs will not boot from the drive)

This is probably the APPLE_DRIVER43 partition, which leads me to suspect
you are using Drive Setup to partition the drive on the Mac.

Doing the partitioning on the IIgs would be the best solution.  Failing
that, a third party driver on the Mac might be more successful (as long
as it can avoid writing a SCSI Manager 4.3 driver).  You probably can't
use Apple HDSC Setup, since it only recognises Apple branded drives
(though it might be possible to patch it to recognise your Quantum
drive).

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P O Box 27-103, Wellington, New Zealand