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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.wildstar.net!cancer.vividnet.com!hunter.premier.net!news-res.gsl.net!news.gsl.net!news.mathworks.com!fu-berlin.de!irz401!orion.sax.de!uriah.heep!news From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.os.linux.misc,comp.unix.bsd.freebsd.misc Subject: Re: Drive Partitioning Date: 28 Jul 1996 08:25:06 GMT Organization: Private BSD site, Dresden Lines: 23 Message-ID: <4tf852$72s@uriah.heep.sax.de> References: <4t73f3$brc_001@evt-pm0-ip11.halcyon.com> <4t8eop$dim@lace.colorado.edu> <31F7FCCA.31F1@ucdavis.edu> Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) NNTP-Posting-Host: localhost.heep.sax.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: knews 0.9.6 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Xref: euryale.cc.adfa.oz.au comp.os.linux.misc:118991 comp.unix.bsd.freebsd.misc:24577 Michael White <mdwhite@ucdavis.edu> wrote: > Are you sure he will be able to boot Linux? I thought you had to have > your boot partitions inside the first 500MB of disk space. No, he's got SCSI. With a common h=64 s=32 emulation, you've got the first 1 GB below ficticous cylinder 1024. If the SCSI BIOS can emulate h=256 s=32 (there's one byte for the head number in the int 0x13 call, but only six bits for the sector number, and sector numbers start at 1), this makes 4 GB below ficticous cylinder 1024. I think this is what some controllers call ``DOS > 1 GB emulation''. The 504 MB limitation is caused by the WD1003/WD1007 only allowing for 16 heads, so with h=16 (WD1003/WD1007 register-level limitation) and s=63 c=1024 (BIOS int 0x13 stupidity), the BIOS reachable area is only 504 MB. -- 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. ;-)