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There were some bits about hdparm and SCSI here, I wish I knew more about SCSI, but one question why would you put scsi emulation on DVD-ROM? secondly after you applied ide-scsi to an IDE device it is no longer known as IDE device to the system it is SCSI, only you know it is IDE but the system knows it is SCSI - this is the whole idea of ide-scsi emulation BTW.
P.S. Unless it is a combo CD-R/RW/DVD-ROM drive of course.
Distribution: Slackware, (Non-Linux: Solaris 7,8,9; OSX; BeOS)
You might try recompiling ". . . hdparm with the include files from
the latest kernel source code." (from the man page). There may
be some ioctl()s that have been added to the kernel that allow
hdparm to work with SCSI. . .
Boris: I am using scsi-emulation on my dvd drive for burning. Some of the programs (like eroaster, xcdroast and others) seem to want to see my source drive as a scsi as well as the burner. So I use scsi emulation on it. I could easily remove this now that I barely use GUI's for cdburner though...
Starhart, yeah, I know you meant that as an example, but that is what the device was before I used scsi emulation on it. It's Secondary Master = /dev/hdc.
Moses: yeah, this might be what I want to do. If I read that correctly, if I use 2.4.20 I might see something of use? Or am I reading that wrong?
I just remembered something, way back when I first started slackin, I screwed up the /dev/hdc device. So anyway, in a lame attempt to fix it, I simply linked /dev/hdc to /dev/scd0 and that's why I am getting the error.
Stupid me! Anyway, I will fix that and then let you guys know how things go. Thanks for the ideas, and sorry I forgot how lame I was
I had to use scsi emulation on my dvd drive or wouldn't use dma mode, heres my grub.conf, adding the lines in bold enabled scsi
# grub.conf generated by anaconda
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd1,0)
# kernel /vmlinuz-version ro root=/dev/hda2
# initrd /initrd-version.img
title Red Hat Linux (2.4.18-18.7.x)
root (hd1,0) kernel /vmlinuz-2.4.18-18.7.x ro root=/dev/hda2 hdc=ide-scsi hdd=ide-scsi
Then I just added hdparm -d1 /dev/hdd to my /etc/rc.d/rc.local and that enables dma mode on boot up, dvds play much much smoother.
All is good that way. It may not be the best method but it works great for me, and if it aint broke I don't mess with it.