Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!snorkelwacker!mit-eddie!uw-beaver!zephyr.ens.tek.com!tekcrl!tekgvs!keithe
From: keithe@tekgvs.LABS.TEK.COM (Keith Ericson)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Input needed on XT Hard Disk
Message-ID: <6706@tekgvs.LABS.TEK.COM>
Date: 19 Jan 90 18:08:09 GMT
References: <7565@shlump.nac.dec.com>
Reply-To: keithe@tekgvs.LABS.TEK.COM (Keith Ericson)
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 34

In article <7565@shlump.nac.dec.com> simon@hpstek.dec.com (Curiosier and curiosier...) writes:
>
>In article <1400021@hp-ptp.HP.COM>, pault@hp-ptp.HP.COM (Paul_Taira) writes...
>
>...I run Maxtor 2190(?) 127 Mb partitioned on my 3 year old XT 
>clone.  Actually, with a modern controller I could get 159 Mb, but my 
>controller BIOS knows only about 1024 cylinder, while the drive has 1124 
>cyl.

If that "modern controller" were an Adaptec 2372B (or C I think they're up
to now?) you could get

	1224 x 15 x 26 x 512 = 244+ Megabytes of FORMATTED capacity
	 ^\    ^\   ^\    ^\
          |      |    |     |
          |      |    |     +-- bytes/sector
          |      |    |
          |      |    +--RLL sectors/track
          |      |
          |      +-- heads (or tracks/cylinder)
          |
          +-- cylinders (sector translation allows DOS to access more
		than it's 10-bit = 1024 cylinder limit)
  
Other manufacturer's controllers may also have the sector translation
capability: my experience is limited - due to good results: why fix what
ain't broken - to Adaptec.

The MAXTOR drives, while not specified to accommodate RLL, are high quality
products and exceed the manufacturer's specifications in this regard.  We
regularly use Maxtor XT-1085's as "standard issue" in this same configuration
and also have many XT-2190's so used.

kEITHe