Next message: Tom Roth: "[WinMac] PC Iomega JAZ restoration utility?"
Thank you for CC'ing me.
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First off, take a vacuum cleaner or air hose to the inside: The 50 scfm fan in
the power supply inhales a boatload of dust!
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I'm dusting off my old A/UX stuff for this one! When you say that the hard
drives are "hung off the back" are they attached to the logic board SCSI ports,
to NuBus SCSI ports; or are they hung off the PDS (Processor Direct Slot) SCSI
card, as found in the AWS 95?
Yes, you can boot from a Disk Doctor or Speed Disk floppy (use v3.2) and
repair & defrag any HFS partitions it can find, i.e. you're operating it just
like a Quadra 950... No big deal.
I held off this suggestion the first time around because of the PDS SCSI card:
It is *not* visible in System 7.1 (or any MacOS version, IIRC). Instead, you
have to wait for A/UX to load so it can load a driver for that card... Which is
lacking in System software.
The way A/UX works on a Quadra is actually similar to how Windows NT loads on
an x86 (but *not* a RISC) machine. Windows NT starts up by first booting up in
16 bit DOS mode using BIOS. Then, it switches to 32 bit mode where the 16 bit
BIOS real mode "drivers" are blown out and 32 bit software device drivers are
loaded from the hard drive. You can tell when an NT/x86 machine is switching
from 16 bit real mode to 32 bit protected mode when the blue screen part of the
boot cycle appears on the screen.
In a 68040 machine the process is similar: The AWS95 (or Quadra 950) first
starts up in it's "real mode" with System 7 with just enough extensions &
control panels to jumpstart the Mac. Then, A/UX starts to load, blowing out the
RAM contents (including the drivers it uploaded fom the Mac ROM and NuBus
expansion card ROM), switching to the protected mode unix operating system and
loading its' own device drivers...Including the driver for the PDS SCSI
controller.
See the parallels now? In short, booting into System 7 will give you access to
disk drives where there is ROM code or a driver... But if there's no
System/MacOS driver (like for the PDS SCSI card), then you can't access the
data on those drives via System.
Hope this didn't confuse you any more!
>-----Original Message-----
>From: Donovan, Harold [mailto:donovan.harold@nbpub.com]
>Sent: Thursday, May 03, 2001 1:47 PM'
>Subject: Defrag or not
>
>
>Sorry Dan,
>
>Does this mean that I should defra the drives and can I boot the server with
>Norton and use speed disk or do I need another utility? By the way, the
>drives are not in a raid, just single drives hung off the back.
>
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: Thu May 03 2001 - 11:17:19 PDT