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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!yarrina.connect.com.au!munnari.OZ.AU!spool.mu.edu!howland.reston.ans.net!Germany.EU.net!zib-berlin.de!irz401!uriah.heep!news From: j@uriah.heep.sax.de (J Wunsch) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: HD geometry woes.. Date: 18 Nov 1995 20:29:33 GMT Organization: Private FreeBSD site, Dresden Lines: 20 Message-ID: <48lfnd$obg@uriah.heep.sax.de> References: <47s6ga$1q1@rosebud.sdsc.edu> <4851me$k0i@uriah.heep.sax.de> <48ibqs$cir@news2.ios.com> 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 0.9.3 rashid@rk.ios.com (Rashid Karimov) writes: >: The correct geometry for an Adaptec is XXXX * 32 * 64, with XXXX being >: the number of megabytes for your drive (rounded down to the nearest >: megabyte boundary). > Is there really a diiference between 32 * 64 and > 64 * 32 - say in speed and/or FS layout optimization ? No, since these figures are only used by the BIOS to load the FreeBSD kernel. FreeBSD uses its own layout figures, and it usually fakes a flat geometry with 4096 blocks per cylinder, since this seems to perform better than any layout optimization on today's drives. -- 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. ;-)