Date: Tue, 15 Sep 1998 19:38:13 -0400 From: Lee Cremeans <lee@st-lcremean.tidalwave.net> To: Terry Lambert <tlambert@primenet.com>, dg@root.com Cc: joelh@gnu.org, tom@uniserve.com, gpalmer@FreeBSD.ORG, irc@cooltime.simplenet.com, freebsd-current@FreeBSD.ORG Subject: Re: Download of FreeBSD 3.0-SNAP Message-ID: <19980915193813.B9468@st-lcremean.tidalwave.net> In-Reply-To: <199809152001.NAA22432@usr09.primenet.com>; from Terry Lambert on Tue, Sep 15, 1998 at 08:01:29PM %2B0000 References: <199809150222.TAA23732@implode.root.com> <199809152001.NAA22432@usr09.primenet.com>
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On Tue, Sep 15, 1998 at 08:01:29PM +0000, Terry Lambert wrote: > > Uh, I think it is reasonable to assume that disk drives have contiguous > > block numbers (except for replacement blocks of course). Sorting by block > > number is the most optimal way of sorting that we can do in FreeBSD. > > If you knew physical cylinder boundries, you could do gathering, > as well. > > In SCSI II, it's possible to know this. It's also possible on all > ST506 and ESDI hardware, and, I think, on EIDE. No such luck for EIDE, unless it's a really old, non-zoned drive such as a Seagate ST157A or WDC 93044, or unless you have the manufaturer's data sheet handy. Almost all EIDE drives completely hide their true geometries from the computer, as far as I have seen. I'm looking at a copy of the ATA-2 final draft here, and it says nothing about mentioning physical geometries (only those those details are "vendor-specific"). :-( -- Lee Cremeans -- Manassas, VA, USA (WakkyMouse on DALnet and WTnet) A! JW223 YWD+++^ri P&B++ SL+++^i GDF B&M KK--i MD+++i P++ I++++ Did $++ E5/10/70/3c/73ac/95/96 H2 PonPippi Ay77 M | mailto:lcremean@tidalwave.net http://st-lcremean.tidalwave.net | Powered by FreeBSD 3.0-CURRENT To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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