[rescue] SCSI2 to IDE (was: Re: SCSI 50 to 68 to 80 pin thingies)

Michael Parson mparson at bl.org
Tue Feb 22 11:54:53 CST 2011

On Tue, 22 Feb 2011, William Enestvedt wrote:

> Alex wrote:
>> ...look for a
>> 750mb or larger 12mm 2.5" parallel SCSI HDD.  Every one that I have
>> ever seen is actually a 9.5mm IDE disk, with the ADTX (or similar)
>> bridge attached, including the ones that Apple sold for their
>> PowerBooks.
>   Wait, I have a 750MB HD from Apple here that was in an old PowerBook
> wich is 12.5mm and 2.5", but it's ATA not SCSI. Am I mis-reading what
> you wrote?

There were some (one?) PowerBooks (I want to say that it might have been
the PB Duo 2300c?) that could take either SCSI or IDE drives.  I
wasn't much into Apple laptops when this was going on, but I've seen the
insides of a Powerbook that belonged to a friend of mine that was set up
this way.  If these shipped from the factory with a larger SCSI drive,
they were IDE disks with bridges.

IBM made a 1.1 gig 2.5" SCSI drive, which is what my Sparcbook 3GX had
in it when I got it.  This was a real SCSI drive, no bridge involved.
>From what I've heard over the years, the Powerbooks that had SCSI drives
larger than that had the ACARD bridges in them, which have the 8 gig
limit and run at SCSI speeds rather than SCSI-2.

The chb25int unit, which is what I have in my Sparcbook, runs at SCSI-2
speeds and does not have the 8 gig limit.  I've currently got it
attached to an 80 gig drive, with no problems.

These days, they seem to be as close to unavailable as to not matter.

Michael Parson
mparson at bl.org

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