Date: Tue, 10 Mar 2009 17:08:10 -0500 From: "William Owens" <wowens1@qwest.net> To: freebsd-hardware@freebsd.org Subject: parallel ata with disk and DVD-RW on same cable Message-ID: <20090310220810.92B431A981F@mpls-qmqp-01.inet.qwest.net>
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Good Day, I have long had problems with putting disk drives and old CD-ROM drives on the same parallel IDE cable and have avoided doing so with more current DVD-RW drives till now. Is this to be expected or must I presume that IDE drives and ATAPI drives just cannot coexist on the same cable? I have a particular need to put both on a single cable. Do I have a chance? Currently I have (from 'atacontrol') atacontrol reinit ata1 Master: ad2 <<ST3300831A/3.03> ATA/ATAPI revision 7 Slave: acd0 <<NEC DVD RW ND-3550A/1.07> ATA/ATAPI revision 0 Because the NEC DVD drive is capable of UDMA33 as a maximum I have tried a 40 pin cable to limit both devices to UDMA33. FreeBSD 7.1 recognizes this and prints a message. The problem exists with either 40 ping or 80 cables. If I write to the NEC DVD from the ad2 disk, both get very slow. Writing from other devices to the DVD also causes the DVD drive to sometimes get very slow ( ~ 1.3 Mb/sec ). The writing is done with 'growisofs' and uses the atapicam kernel module which turns /dev/acd0 into the SCSI device /dev/cd0. Resetting with the 'atacontrol' command brings back a more normal speed (4-9 Mb/sec) for a time. So, the question, Do I have any right to expect disk drives and DVD (atapi) drives on the same parallel cable to work? Thanks for your consideration. Will Owens
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