Date: Mon, 17 Jan 2000 13:45:03 -0800 (PST) From: Brian Beattie <beattie@aracnet.com> To: "Ronald F. Guilmette" <rfg@monkeys.com> Cc: Jim Shankland <jas@flyingfox.com>, hackers@FreeBSD.ORG Subject: Re: "very dangerously dedicated mode" is Message-ID: <Pine.LNX.4.10.10001171340210.32085-100000@shell1.aracnet.com> In-Reply-To: <54647.947879091@monkeys.com>
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On Fri, 14 Jan 2000, Ronald F. Guilmette wrote: > > One fact that I found out the hard way however... and that ISN'T in the > FAQ... is that if you have a SCSI drive that was low-level formatted > while your SCSI _controller_ was set with ``BIOS address translation'' > either on or off, and if you then _change_ this SCSI controller setting > (off -> on, or on -> off) and then try to use the previously-low-level- > formatted drive on the controller while it is set that way, you may per- > haps experience some grief. One reason it is not in the FAQ, is that the low-level formating of a SCSI drive is totally unrelated to the BIOS and/or it's notion of geometry. SCSI disks are accessed by logical block number only. What you may have been experienceing is a disk formatted with a block size != 512 bytes. It is possible to format (many/all) SCSI drives with a block size other than 512 bytes. > > I had one SCSI drive in a system that was working perfectly well, and > then I tried to add another _identical model_ drive from a different > system and every tool I used to tell me what the second drive believed > its geometry to be showed the geomery for the drive as being clearly > incorrect... according to the info contained in the FAQ page at the > above URL... for the current translation/non-translation setting of my > SCSI controller. > Brian Beattie | The only problem with beattie@aracnet.com | winning the rat race ... www.aracnet.com/~beattie | in the end you're still a rat To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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