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List:       classiccmp
Subject:    Info on Amstrad 40095/A / DRMD20A12A MFM HDD
From:       Philip Pemberton <classiccmp () philpem ! me ! uk>
Date:       2011-06-03 20:51:34
Message-ID: 4DE94956.6020506 () philpem ! me ! uk
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Hi guys,

Someone has just donated an old ST506 hard drive to the DiscFerret 
project... This time, it's an Amstrad drive, with part number 40095/A 
"DRMD20A12A".

Thing is, I can't seem to find any information on it -- and at the very 
least I need to find out what the CHS settings are in order to create a 
DriveSpec file.

Here are a couple of photos:
   Top of drive:
     http://twitgoo.com/2bnvcy / http://i52.twitgoo.com/n7yp.jpg
   PCB:
     http://twitgoo.com/2bnvdl / http://i53.twitgoo.com/2cgzc0k.jpg

Major chips are:
   Hitachi HD63B01Y0P
   SanKen STA435A
   Hitachi HA13426
   CF77143FT
   SSI 540-3CH S8714 32119.1.1F
   Hybrids: SC619 and SC628

Text at top corner of PCB near power connector: PY349C

Head stepper motor is labelled:
   TYPE   103-4902-0320
   10.5VDC  0.26A  0.9 DEG/STEP
   LOT NO. 05709I
   6035095-1

Form factor is 3.5-inch, half-height (about the same height as a 5.25 HH 
MFM drive)

 From what I can gather, it's a 20MB MFM drive, with four heads -- 
there's a sticker on the top which reads:
   DEFECT:CYLINDER
   HEAD0

   HEAD1  327  386  426  504

   HEAD2

   HEAD3  216

(The numbers are handwritten -- badly)

There's a second sticker along the edge:
   W A R N I N G

   WARRANTY VOID
   IF THIS SHIELD
   BROKEN

Does anyone have any idea what this thing might be?