Date: Fri, 21 Dec 2001 23:10:10 -0500 From: "Andrew C. Hornback" <achornback@worldnet.att.net> To: "Nuno Teixeira" <nuno.mailinglists@pt-quorum.com>, <freebsd-hardware@freebsd.org> Subject: RE: "DMA limited to UDMA33, non-ATA66 compliant cable" Message-ID: <002301c18a9e$8c5178e0$6600000a@ach.domain> In-Reply-To: <20011220213749.GD29443@gw.tex.bogus>
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> -----Original Message----- > From: owner-freebsd-hardware@FreeBSD.ORG > [mailto:owner-freebsd-hardware@FreeBSD.ORG]On Behalf Of Nuno Teixeira > Sent: Thursday, December 20, 2001 4:38 PM > To: freebsd-hardware@freebsd.org > Subject: "DMA limited to UDMA33, non-ATA66 compliant cable" > > Hello to all, > > I have a ATA33 motherboard and a IBM ATA100 disk. > > My questions/doubts are: > > - if the motherboard controler is ATA33 then the maximum > ATA that IBM > disk can reach is ATA33, right? Yes, your limiting factor is the motherboard's controller. You may want to upgrade to an add-on controller for better performance from your disk. > - if the above question is true, then why a message like > "ata0-master: > DMA limited to UDMA33, non-ATA66 compliant cable" knowing that the > motherboard controller is ATA33 and has been probed by kernel? I think the probe looks at what the drive's firmware replies that it's capable of and then looks at the speed that the cable is capable of handling. That's not something I'd worry about if you know that your controller is ATA33 and your drive is faster. --- Andy To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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