Date: Sun, 25 Feb 1996 10:49:39 +0100 (MET) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-scsi@freebsd.org Cc: petzi@zit.th-darmstadt.de (Michael Beckmann) Subject: Re: Block size on hard disk Message-ID: <199602250949.KAA14773@uriah.heep.sax.de> In-Reply-To: <v02140b00ad54e4dbfbcc@[130.83.177.1]> from "Michael Beckmann" at Feb 24, 96 05:47:25 pm
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As Michael Beckmann wrote: > I have a 4 GB SCSI disk (DFHS) from IBM in my system, attached to an NCR > 810 controller. It is formatted for 512 bytes per block, like mosts hard > disks. I noticed that the disk can be formatted for 512, 1024 and 2048 > bytes per block. There are enough disks around which you could format to any weird sector size. Something like ``must be between 2 and 65536 bytes'' or so. > I was thinking whether it would be wise to reformat it for > 1024 B/block. The current ufs implementation doesn't grok it. I've got patches in the queue from some Japanese guy to fix this, since it is also needed for MOD's where you gotta live with them being hard-sectored. 1024 bytes per sector are frequent there, and he told me about rumours that some newer drives come with media up to 4096 bytes per sector. (Though i think the latter will result in a huge waste of disk space, since the ufs fragment size must be at least as big as the physical sector size. See the daemon book for wastage figures.) If you are interested to test the patches, i'm more than happy to forward it to you. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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