Date: Thu, 25 Oct 2001 12:00:43 +0200 (CEST) From: Nils Holland <nils@tisys.org> To: freebsd-questions@freebsd.org Subject: UDMA66 - One cable, two modes? Message-ID: <20011025115305.E240-100000@howie.ncptiddische.net>
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Hi all, reading through my /var/log/messages I just noted something that caught my attention because it seems strange to me. Have a look at the following any pay attantion to the two hard disks on ata0: Oct 24 15:56:31 howie /kernel: ad0: 12416MB <WDC AC313000R> [25228/16/63] at ata0-master UDMA66 Oct 24 15:56:31 howie /kernel: ata0-slave: DMA limited to UDMA33, non-ATA66 compliant cable Oct 24 15:56:31 howie /kernel: ad1: 8063MB <FUJITSU MPE3084AE> [16383/16/63] at ata0-slave UDMA33 Oct 24 15:56:31 howie /kernel: acd0: CDROM <ATAPI CDROM> at ata1-master using PIO4 Oct 24 15:56:31 howie /kernel: acd1: CD-R <CR-4801TE> at ata1-slave using PIO3 What does this tell us? Well, the primary master, a Western Digital hard disk, is correctly initialized to use UDMA66. However, the primary slave, which is a UDMA66-compliant drive made by Fujitsu is only using UDMA33. That is justified by the message saying that the ata0-slave cable is not UDMA66-complaint. Now ... how can that be? The cable to which both of these hard disks are conencted is the same one, as both are connected to the primary port. So, how can the first drive work at UDMA66, while the slave complains about a non-compliant cable? The only thing that comes to my mind trying to explain this is that it's probably not the cable causing the problem, but the IDE controller on the mainboard. Still, any comments on this are welcome! Greetings Nils Nils Holland Ti Systems - FreeBSD in Tiddische, Germany http://www.tisys.org * nils@tisys.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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