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From: karl@ddsw1.MCS.COM ([Karl Denninger])
Newsgroups: comp.sys.ibm.pc
Subject: Re: Drive type 20 setting
Keywords: IBM AT harddrive
Message-ID: <[2766.5]karl@ddsw1.comp.ibmpc;1>
Date: 21 Apr 89 18:00:08 GMT
References: <1898@umbc3.UMBC.EDU>
Lines: 24

>In article <1898@umbc3.UMBC.EDU> you write:
>>According to the documentation I have the ST-4038 is a drive
>>type 20.  My IBM Advanced Diagnostic setup disk only allows
>>drive types to range from 1 to 15.  How do I set the drive

>Response 4 of 4 (2766) by u3ky at vax5 on Fri 21 Apr 89 11:41
>Early IBM ATs have a bios that supports only 15 drive types.....

Another solution is to get a controller with a "spoofing" BIOS, such as the 
WD1006-VSR2 (RLL) or the Adaptec ACB2372B. 

These will override your disk drive type internally, permitting you to not 
only get the full capacity of the drive, but also (in some cases) use an RLL 
format.  This all assumes that the RLL format is supported by your drive; if 
not, it may work or it may not.  The only way to be certain (if it's not 
certified) is to try it, and keep good backups for the first few months just 
in case.

disclaimer:  We sell the WD1006VSR2 boards, so I am understandably biased.

--
Karl Denninger (karl@ddsw1.MCS.COM, <well-connected>!ddsw1!karl)
Public Access Data Line: [+1 312 566-8911], Voice: [+1 312 566-8910]
Macro Computer Solutions, Inc.  "Quality Solutions at a Fair Price"