Date: Wed, 1 Nov 1995 12:07:59 +1030 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: terry@lambert.org (Terry Lambert) Cc: msmith@atrad.adelaide.edu.au, terry@lambert.org, lenzi@cwbone.bsi.com.br, hackers@FreeBSD.ORG Subject: Re: boot disk.... Message-ID: <199511010138.MAA05178@genesis.atrad.adelaide.edu.au> In-Reply-To: <199510311932.MAA10356@phaeton.artisoft.com> from "Terry Lambert" at Oct 31, 95 12:32:35 pm
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Terry Lambert stands accused of saying: > > > Terry Lambert stands accused of saying: > > > Why? We don't *have* to insist that we be able to boot from an 'a' slice > > > after 1024, do we? That's a requirement you've tacked on. > > > > It's becoming a very common requirement 8( > > It's one that DOS and Win95 don't meet. That's 80% or more of Intel class > machines right there -- doesn't seem very common. You miss my point. Joe Luser wants FreeBSD on his w95 machine. Us nice people talk him into using fips to shrink his 1.6GB FAT filesystem (stop puking Terry 8) down to "as small as possible". He comes back and complains that he can't boot. After a week of confusing replies we discover that because he has seperate copies of every version of Doom ever released, and more than two Microsoft products, "as small as possible" is still >1024 cylinders. We should be able to work in this situation; the fact that it's almost impossible notwithstanding. In fact, it's not impossible, it's just that we would have to play so far outside the rules that we'd stand a good chance of screwing everything up 8( > Media perfection impact write ordering algorithms. As such, it must be > visible to the upper layer I/O subsystem, even if it is infact implemented > in hardware. I think that the nightmare that would be involved in attempting to outthink a modern SCSI drive's behaviour in the presence of forwarded sectors would cost more than it would save. In the case of an IDE disk, where requests are handled in-order, your point is well taken. > Terry Lambert -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] My car has "demand start" -Terry Lambert UNIX: live FreeBSD or die! [[
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