2.5" laptop SCSI drive standards?

[Sridhar Ayengar]

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.  When the disk on the
> one at work got too crowded, I replaced it with a 50 MB ST412 ("MFM")
> disk and ISA controller, ignoring the motherboard disk controller.  I
> remember the size because it was too large for a single partition
> under DOS 3.x, so we had a new "D:" drive that caused some confusion
> for some of the users (they had only experienced machines with 30MB
> and smaller drives up to that point.)

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?

Peace...  Sridhar