-----Original Message----- From: Jason D. Clinton

On Fri, 2007-03-09 at 16:00 -0600, Billy Crook wrote:

...

I've looked around the web for ways to optimize your Linux system. hdparm was mentioned a lot, but my drive is sata, and my

cdrom is set

...

to be recognized as SCSI because as IDE, its throughput was

too jerky

...

to watch DVDs. When I tried to turn on DMA, hdparm kept throwing a fit about "HDIO_SET_DMA failed: Inappropriate ioctl for device". sdparm doesn't seem to offer the same. For example, I wand to use 32-bit transfer mode with sync, hdparm won't cooperate, and sdparm doesn't know what I'm talking about.

This will happen if the BIOS currently has the device in PIO mode. See if you can put the device in UDMA mode from within the BIOS drive view. You definitely do not want to use SCSI emulation these days.

I thought that Linux completely ignored the BIOS settings and they were just there to get the hardware initialized and spun up. And then once Linux booted that it would assign its own settings to hardware.