home *** CD-ROM | disk | FTP | other *** search
- Path: news.mountain.net!usenet
- From: gene_heskett@wvlink.mpl.com (Gene Heskett)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Zip Drive Geometry
- Date: 27 Feb 96 09:58:08 +0500
- Organization: MountainNet, Inc. Morgantown WV 800.444.1458
- Message-ID: <1824.6631T598T423@wvlink.mpl.com>
- References: <4glcie$b66@fcnews.fc.hp.com> <4gs5ab$alg@eken.hv.se>
- NNTP-Posting-Host: slip12.mpl.com
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP)
-
-
- HW> In article <4glcie$b66@fcnews.fc.hp.com>, tomk@fc.hp.com (Tom
- HW> Kennedy) writes:
- >>David Evans (devans@ccubb.com) wrote:
- >>: Does anyone know the geometry of a ZIP disc? I seem to have the
- >>: wrong layout and format doesn't work...
- >>
- >>It's got 196608 sectors. You can pick any geometry that has that
- >>number of sectors. (I use 8 sec/track, 2 heads, 12288 tracks.)
-
- HW> Why so few secors and so many tracks? Isn't that a major
- HW> performance loss? The number of seeks for a track increases a
- HW> lot, and that time is a lot higher than the time required to
- HW> revolve the disk one rotation. Just my humble opinion...
-
- HW> /Henrik
-
- Henrik;
-
- It normally doesn't make any difference to a scsi device since the
- internal physical disk format is not something we have had any
- control over in quite some time now.
-
- The track and sector numbers are normally chosen so that they
- duplicate as close as possible, without going over, the actual
- capacity of the disk. The controller in the computer asks for a
- sector based on tracks*sectors_per_track*head, commonly called the
- Logical Sector Number, and the controller on the drive then
- translates that often quite large number back into the actual
- location on its platters. We, the users, have no way of accessing
- what may be on the drives actual track 117, sector 3, head 5 except
- by pure dumb luck! Thats what he meant above when he said to pick
- any set of numbers that totalled up to 196608 sectors. The actual
- Logical Sector Number (LSN) is the only address that in fact goes up
- the cable to the drive.
-
- Cheers Henrik, Gene
-
- /* Gene Heskett | These opinions are NOT to be */
- /* CE @ WDTV Weston/Clarksburg WV | confused with the official */
- /* <gene_heskett@wvlink.mpl.com> | WDTV managment views */
- #include <std.disclaimer>
-
-
-