7 Apr
2007
7 Apr
'07
4:37 p.m.
Date: Sat, 7 Apr 2007 12:29:49 -0500
From: "Ethan Dicks" <ethan.dicks at gmail.com>
Subject: Re: ST506 WTB:Micropolis 1325
<snip>
There were probabably a few others. I doubt there
were any 3.5"
drives over 40 MB, though.
<snip>
Seagate ST151 and 157R, just to name two...
> The largest MFM drive ever made was _probably_ the
Maxtor 2190 at 190MB
> unformatted. ISTR that there was a logical limit to the number of
> cylinders due to the control protocol (or perhaps limitations in the PC
> BIOSes of the time) and physical limits to the number of sectors/cylinder
> and the number of platters (the 2190 had 15 or 17?)
That's certainly close to the largest, if not the
absolute largest.
DEC took the XT2190 and formatted it at 154MB as the RD54. I have a
few in MicroVAXen. Much more solid than the RD53 (Micropolis 1325),
and no jumper moving required (there's a single solderable jumper that
must be installed to turn a generic 1325 into an RD53 so that the
customer-runnable formatter recognizes it).
-ethan
XT1240R: 196MB (RLL2,7) vs XT2190: 159MB (MFM)
m