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Path: utzoo!mnetor!uunet!husc6!think!ames!oliveb!sun!pepper!cmcmanis
From: cmcmanis%pepper@Sun.COM (Chuck McManis)
Newsgroups: comp.sys.amiga.tech,comp.sys.amiga
Subject: Re: Getting a Mac Hyperdrive to work with a A2090
Message-ID: <47681@sun.uucp>
Date: 31 Mar 88 06:56:51 GMT
References: <2955@gryphon.CTS.COM> <8633@g.ms.uky.edu> <3006@gryphon.CTS.COM> <759@elxsi.UUCP>
Sender: news@sun.uucp
Reply-To: cmcmanis@sun.UUCP (Chuck McManis)
Organization: Sun Microsystems, Mountain View
Lines: 25

In article <759@elxsi.UUCP> matt@elxsi.UUCP (Matt Shaver) writes:
->I am using an ST251N drive internal to the A2000 ...
->
->As far as I can tell the drive physically has:
->                 4  heads
->                26  sectors per track
->               818  cylinders

Actually the Seagate is saving one sector per cylinder for bad block sparing
on that cylinder. The most effective entry in this case is
		1 	heads
		103 	sectors/track
	   	818 	cylinders
Which exactly uses your entire drive.

The same logic needs to be applied to the MiniScribe 8425 drive which has
17 sectors/track but on one cylinder is saves one for a bad block. Thus
you tell it it has 1 head with 67 sectors per track. It's all mumbo jumbo
to SCSI because the SCSI stuff is talking 'Logical' blocks anyway. It
doesn't know what a cylinder or head or track is, thats all internal.


--Chuck McManis
uucp: {anywhere}!sun!cmcmanis   BIX: cmcmanis  ARPAnet: cmcmanis@sun.com
These opinions are my own and no one elses, but you knew that didn't you.