3.5" ESDI (was Re: 2.5" laptop SCSI drive standards?)

[Ethan Dicks]

On 9/22/09, Sridhar Ayengar <ploopster at gmail.com> wrote:
> Ethan Dicks wrote:
>> On 9/22/09, Sridhar Ayengar <ploopster at gmail.com> wrote:
>>> Zane H. Healy wrote:
>>>> Wow, there is something I never knew.  There were 2.5" ESDI HD's?!?! I
>>>> didn't even know there were any smaller than 5.25".
>>> Come to think of it, didn't the PS/2 Model 70 have a 3.5" ESDI?
>>
>> That sounds familiar.  The PS/2 Model 30 (not 286) came with a 3.5"
>> ESDI drive - with a full-width edge connector.
>>
> The full width edge connector drive was the one on the Mod 70, wasn't
> it?  I thought the Mod 30-8086 came with only two floppy drives?  Wasn't
> the Mod 30 hard drive option a 3rd party jobbie?

This was 100% Big Blue.  It was the only PC in a DEC shop, bought by
and for the accountants who needed to run DOS-based accounts
receivables and payroll apps.

I'm willing to accept that it's some bizzaro IDE or MCA bus-extension
drive (it does *not* have the usual ESDI cabling arrangement that I'm
used to), but I was told at the time I was looking for an upgrade path
that it was an ESDI drive - perhaps it's some flavor of IDE drive with
an embedded ESDI controller, not an embedded MFM controller.

-ethan