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From: jjm@pecnos.UUCP (Jim Moseman)
Newsgroups: net.micro.pc
Subject: Re: How do set drive size > 10mb?
Message-ID: <145@pecnos.UUCP>
Date: Thu, 5-Dec-85 10:30:16 EST
Article-I.D.: pecnos.145
Posted: Thu Dec  5 10:30:16 1985
Date-Received: Fri, 6-Dec-85 07:21:35 EST
References: <970@mako.UUCP> <452@nicmad.UUCP>
Reply-To: jjm@pecnos.UUCP (Jim Moseman)
Distribution: net
Organization: Perkin-Elmer SSD, Tinton Falls, N.J.
Lines: 18

Actually, it is possible to format a 15MB disk under DOS 2.0 or 2.1.
The size is determined by the table selected in the BIOS extension ROM.  
In my case, I was using a Western Digital Controller which defaulted to
table 3.  For the ROM, I was using this was for a 10MB drive (4 heads).  I
put in a jumper on position 3 of SW1 to select table 2 which (again, on the
ROM I am using) is for a 15MB drive (6 heads).  After reformatting, and
running FDISK again, the partition had increased from 10 to 15 MB.  All
this was done under DOS 2.0.  Note: you must make sure that the ROM you are
using has a table which matches the characteristics of your drive or allows
you to build your own table.  

By the way, I am using the default interleave factor of 3.  Does anyone
have any experience with other factors?


-- 
Jim Moseman @ CONCURRENT Computer Corporation, Tinton Falls, N.J.
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