Date: Sat, 10 Oct 1998 14:46:29 -0700 (PDT) From: Alex <garbanzo@hooked.net> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: hackers@FreeBSD.ORG Subject: Re: how fast are "fast" CDROM drives ? Message-ID: <Pine.BSF.4.00.9810101445130.13820-100000@zippy.dyn.ml.org> In-Reply-To: <199810101313.OAA16631@labinfo.iet.unipi.it>
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On Sat, 10 Oct 1998, Luigi Rizzo wrote: [...] > 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 Well, some of the earlier high speed CDs 12x+ cheat a bit by rotating the disk faster only for certian parts of the disc (the outter edges IIRC). The most inner part of the disc would then be read at somewhere around 6x. - alex To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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