Date: Mon, 12 Oct 1998 09:50:30 -0400 (EDT) From: Jamie Bowden <jamie@itribe.net> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: hackers@FreeBSD.ORG Subject: Re: how fast are "fast" CDROM drives ? Message-ID: <Pine.SGI.3.96.981012094626.26048S-100000@animaniacs.itribe.net> In-Reply-To: <199810101313.OAA16631@labinfo.iet.unipi.it>
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On Sat, 10 Oct 1998, Luigi Rizzo wrote: > Well it seems that everybody here is crazy to upgrade their CDROM > drives to the fastest unit they can get, but i wonder if it makes any > sense... > > I got a 32x ATAPI unit one month ago and there is no way (under > -stable) i can get more than 2.2MB/s by dd'ing from the disk. > Considering i get 5-6MB/s from a raw IDE disk (and from iozone with > large files) on the same machine, i don't think the limiting factor is > CPU or the OS. > > I wonder if anybody is able to exploit the speed of their 24/32/40x > IDE or SCSI drives I have a Plextor 32X SCSI cdrom which is capable of doing 20MB/s transfers. It has an ultrascsi interface on it. I installed FreeBSD 2.2.7 using it, and was never able to get above 10MB/s because the file usually finished before the cdrom had a chance to spin up fully. It was impressive to watch the numbers on the bottom of the screen climb that high. My old ATAPI (Mitsumi) 6x only did about 1 - 2MB/s. Jamie Bowden -- Systems Administrator, iTRiBE.net If we've got to fight over grep, sign me up. But boggle can go. -Ted Faber (on Hasbro's request for removal of /usr/games/boggle) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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