Booting OS X from an External SCSI Drive
From Jeffrey Kafer
Charles,
I can't be entirely certain, since I've fiddled with so many
different configurations, but I believe that I have successfully booted
from external SCSI devices with Old World machines under OS X. My
trusty CD300 CD-ROM drive (that uses CDs in caddies) has been
indispensable for installations and upgrades, and [it's case] also has
served as a temporary home for SCSI hard drives on many occasions.
With regard to the 8 GB partition rule, I thought that only applied
to IDE drives, not SCSI devices. I am almost positive that the SCSI
drive in my 7300 is larger
than 9 GB and boots into OS X 10.2 without partitioning.
Jeffrey
Hi Jeffrey,
Thanks for the report.
Booting from external FireWire drives is certainly
possible. I do it all the time. My only nominally OS X supported
Old World Mac is a WallStreet PowerBook, but it
won't even boot from a Jaguar install CD.
Since an internal SCSI drive just connects to the SCSI
bus, external or internal should not be an issue, one would think.
Charles
Editor's note: The 8 GB restriction applies specifically to
IDE/parallel ATA hard drives. dk
Installing OS X on a WallStreet Using an External
CD-ROM
From Geoffrey Peters
I read Mat's letter to you (see Can
WallStreet Boot into OS X from a SCSI CD Drive?), and I can offer
something of a solution and a bit of relevant information for you &
your readers. Apologies for the length, but the details are
important.
Mat, it sounds as if the centre-frame chassis is warped, or at the
very least has been reinstalled incorrectly. It's an incredibly fiddly
piece to get "just so"; failure to do so means the battery won't latch
properly and/or the optical drive pod won't seat properly. As for the
PC Card cage - warping, or one of the retaining catches is broken. The
entire cage will need replacing - check
eBay, a surprising number of loose PowerBook parts always seem to
be available.
As for your desire to get OS X onto it, yes, it can be done. But
you're going to have to rely on your WallStreet's internal hard drive,
and you're going to need an appropriate universal Mac OS 9.1 Installer
CD, as well as your external CD drive. As you want to run 10.3.9 (a
wise choice, in my opinion), you should use the last build of
XPostFacto 3, not 4 - newer does not always equate to
better. You should also make sure that the OS X 10.3 discs you have are
suitably "universal" enough; by this, I mean that they should be 10.3 -
no greater than 10.3.2 - and a true install set, and not an Update
set.
If you chose to work from backups instead of risking your precious
OS X masters, be careful as to what kinds of media they are burnt
to. Many older CD drives - and essentially all of Apple's SCSI drives
up to and including the 24x speed - cannot read CD-Rs that use
p-cyanide (the common light green or almost-silver yellow-green ones),
which is unfortunately most of them. You will need to make new copies
using blue-dye Verbatim AZO CD-Rs or find some old "gold" 2x or 4x
speed CD-Rs.
Firstly, ascertain that the SCSI CD drive is correctly configured
and is a model that is recognised as a bootable device by the Mac. Then
insert the 9.1 CD into the drive, restart the Mac, and press the C key
until you see the blue smiley Mac face. You should hear the CD seek,
and eventually be presented with the cream-and-disc desktop pattern
that says you've booted from the CD successfully.
If the Mac ignores the CD entirely and either tries to boot from the
Mac's internal hard drive or gives you the dread "blinking drive
folder", then either the SCSI device is not set up correctly, there is
a cabling problem, or the drive is a mechanism that the WallStreet
cannot recognise without a driver.
If your SCSI CD drive is a "pull" from another Mac, then you either
have a cable problem or a termination problem. If you have access to
another Mac with SCSI - preferably not another laptop - test it there.
If it works, then the CD drive is over-terminated. Most Apple laptops
do not provide the TRMPWR voltage, so there's nothing to power the
passive terminators that are either jumpered to "Terminator Enabled" on
the drive mechanism itself, or the common passive terminator block on
the back of the case.
Check for both and remove both, then try the above test again. If it
fails again, check the quality of your SCSI cabling, starting with the
IDC cable run inside your external SCSI case. If you are using the
official Apple HDI-30 to 50-way Amphenol cable, you aren't terminated,
and the internal SCSI cable appears fine, odds are the CD mechanism
itself is the problem. If you are using a HDI-30 adaptor and a normal
25-to-50 cable, it could be the adaptor - in my experience, they're not
very robust - often individual pins will sneak back into the adaptor's
housing. If the main SCSI cable you're using is thin - that is,
flexible enough to easily tie a basic bow-knot in it - discard it and
find a stiff, thick one. Those thin SCSI cables are an abomination, and
I cut and discard every one I encounter.
Yes, this is fiddly. Douglas Adams
once said, "Getting SCSI right is one part know-how, one part
experience, one part luck, and three parts voodoo." Clever man, was our
Doug.
Once you have an external CD, you can boot your WallStreet into Mac
OS 9, and we can continue.
Copy XPostFacto, uncompressed, to a CD-R and copy it to the top
level of the WallStreet's hard drive. Boot from the OS 9 CD, then
drag everything but the XPostFacto folder to the Trash and empty it.
[Editor's note: You did back up all your important files, didn't you?]
Install a fresh version of OS 9 from the CD - ensure you check
"Update hard disk drivers" - and leave everything else as default; do
not customise what gets installed and what does not.
Once complete, go to the Startup Disk control panel and ensure the
WallStreet's hard drive is the startup device. Restart.
If the Apple CD/DVD ROM driver extension in
OS 9 can't see it, neither will the patched OS X
installer.
Once you have the desktop back, insert OS X Install Disc 1. If it
fails to mount on the desktop, either your media is bad (try the
originals if you're working from backups), or you're using a CD
mechanism that OS 9 doesn't recognise. If this happens, give up
now and find a different CD-ROM mechanism, preferably one from an old
SCSI Mac. If the Apple CD/DVD ROM driver extension in OS 9 can't
see it, neither will the patched OS X installer.
Insert OS X Install Disc 1 and wait for it to mount to the desktop.
Now you can launch the XPostFacto app. Choose the Install CD as your
install source, and the hard drive as the destination, and let 'er
rip.
XPostFacto will write its little bootx and modified microkernel to
your hard drive and then restart. When it does, you will hear a tiny
amount of activity from the hard drive as the bootx is loaded from it -
it, in turn, boots the disc in your external CD drive and loads
OS X and then the Installer. You should now be able to complete
the installation normally, and once done, restart into OS X from
the hard drive.
Geoffrey
Hi Geoffrey,
Thanks do much for this detailed tutorial.
Charles
