Date: Wed, 7 Jun 1995 19:38:58 +1000 From: Bruce Evans <bde@zeta.org.au> To: hackers@freebsd.org, hoffman@Ipsilon.COM Subject: Re: 2.0.5 scsi boot configuration whine Message-ID: <199506070938.TAA11194@godzilla.zeta.org.au>
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>I have a single drive on an NCR SCSI with an unfortunate geometry: >2234/7/68. It doesn't seem to matter if the FreeBSD starts at 0, 4 >(which is where 2.0.5 puts it), or 68 (which is where 2.0.5 will put >it after being corrected about the geometry using "G" in the new >fdisk). when corrected about the geometry, it will come up next time >as 37978/7/4, the same total number of blocks, but using BIOSs 6 bit >sector count. The sector count gets truncated to 6 bits when it is stored in the partition table, so it must be < 64 to work. fdisk and sysinstall should reject sector counts >= 64 (and head counts > 256, and cylinder counts >= 65536; head counts of 256 requires special handling if they work at all, cylinder counts >= 1024 require special handling but should work). Try telling sysinstall an equivalent geometry, e.g., 2234/28/17, or boot with -v to see what the BIOS thinks is the geometry. Bruce
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