Path: utzoo!attcan!utgpu!watmath!iuvax!rutgers!aramis.rutgers.edu!topaz.rutgers.edu!kaldis
From: kaldis@topaz.rutgers.edu (Theodore A. Kaldis)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Installing second disk on True Blue
Message-ID: 
Date: 15 Aug 89 12:31:19 GMT
References: <4352@portia.Stanford.EDU> <216100121@trsvax>
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 28

In article <216100121@trsvax> slimer@trsvax.UUCP writes:

>   I used to do this alot... let's see... I believe the problems could be
>   the fact that a TYPE 2 does not represent a 20MEG drive. The drive TYPEs
>   represent the number of cylinders and heads on the physical drive.

>   What you would need is a list of the TYPEs by cylinder and head numbers,
>   then compare your new drive to these TYPEs to find the correct match.
>   Of Course...this is only one item that could be the problem. I know that
>   in some machines I have worked on... a IBM OLD 20MEG is a TYPE 2 while
>   some newer 20MEGs by third parties are TYPE 4.

Are you certain about this?  I was under the impression that all
clones use the same numbers to designate drives.  Type 2 is a 615
cyl., 4 head, 17 sect. drive with 300 precomp. (the setting used for
for Seagate 225's).  Type *6* is also a 20 meg with the same specs,
except no precomp.  (Type 4 is a 65 Meg drive.)  There are also a
several other 20 Meg configurations (types 9?, 16?), one with 820
cyls. and 3 heads, and one with 612 heads instead of 615.  If anyone
is interested, I can post a list of about 40 of these, with their
corresponding type #'s.
-- 
              Theodore A. Kaldis                      |  "Perhaps we may
              +-+-+-+-+-+-+-+-+-                      |   frighten away
      email:  kaldis@topaz.rutgers.edu                |   the ghost of so
       UUCP:  {...}!rutgers!topaz.rutgers.edu!kaldis  |   many years ago
 U.S. Snail:  P.O. Box #1212, Woodbridge, NJ  07095   |   with a little
 ex-Ma Bell:  (201) 283-4855  (voice)                 |   illumination . . ."