Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!zaphod.mps.ohio-state.edu!van-bc! From: lphillips@lpami.wimsey.bc.ca (Larry Phillips) Newsgroups: comp.sys.amiga.tech Subject: Re: AmigaDos 1.3 disk limits Message-ID: <2108@lpami.wimsey.bc.ca> Date: 8 Oct 90 11:24:31 GMT Lines: 32 Return-Path: To: van-bc!rnews In <14952@cbmvax.commodore.com>, ken@cbmvax.commodore.com (Ken Farinsky - CATS) writes: >In article <34582@cup.portal.com> Donald_B_Phillips@cup.portal.com writes: >>Does anybody know what the maximum block number is for a hard disk? I've got >>a Maxtor 8760S drive (which I finally got to work with the A2090 controller) >>and can only address about 1250 cylinders out of a possible 1632. The drive >>has 15 heads & 54 sectors per track, which is what I'm using in the mountlist. >> >>The drive is a SCSI device. Am I possibly hitting some other limit for >>sectors/track or cyliders? > >I believe that the 2090 is limited in the number of heads it can deal >with (I think 7 or 8 max.) What you should do is cut the number of heads >to something like 5, increase the sectors per track to come up with >the correct total. SCSI only cares about the total number of sectors. >You could tell it 1 head and it would be ok, only a sector number is >passed to the drive for access. I have run SCSI disks on the 2090(A) with 15 heads specified in the mountlist. I believe the 8 head limitation is on the the ST506 interface only (and is a real limit). It does, however, pay to try a few other configurations on a SCSI drive. -larry -- It is not possible to both understand and appreciate Intel CPUs. -D.Wolfskill +-----------------------------------------------------------------------+ | // Larry Phillips | | \X/ lphillips@lpami.wimsey.bc.ca -or- uunet!van-bc!lpami!lphillips | | COMPUSERVE: 76703,4322 -or- 76703.4322@compuserve.com | +-----------------------------------------------------------------------+