Editing hdparm and enabling DMA for DVD drive

IndyGunFreak · 10-11-2006, 10:42 AM

I don't understand what I'm doing wrong, but it just doesn't work. I usually have to enable DMA whenever I log out/Log in...

I followed the instructions on this page...

https://help.ubuntu.com/community/DMA

Quote:

#/dev/discs/disc0/disc {
# mult_sect_io = 16
# write_cache = off
# spindown_time = 240
#}

#/dev/discs/disc1/disc {
# mult_sect_io = 32
# spindown_time = 36
# write_cache = off
#}

#/dev/cdroms/cdrom0 {
# dma = on
# interrupt_unmask = on
# io32_support = 0
#}

#/dev/hda {
# mult_sect_io = 16
# write_cache = off
# dma = on
#}

#command_line {
# hdparm -q -m16 -q -W0 -q -d1 /dev/hda
#}

/dev/hdc {
dma = on
}

I've also tried running the "keep settings" command noted on the above webpage, and it doesn't "keep them"

. I did narrow down that my DVD drive is definitely HDC, so I'm not enabling the wrong device...

Thanks in advance

IGF

Caeda · 10-16-2006, 10:55 AM

?????????????????

#command_line {
# hdparm -q -m16 -q -W0 -q -d1 /dev/hda
#}

/dev/hdc {
dma = on
}

Just use the hdparm -d1 /dev/hdc as the conf file shows you for hda...

IndyGunFreak · 10-16-2006, 01:08 PM

Quote:

Originally Posted by Caeda

?????????????????

Just use the hdparm -d1 /dev/hdc as the conf file shows you for hda...

Just to make sure I understand what you're saying, you're saying to more or less copy this line...

Quote:

#command_line {
# hdparm -q -m16 -q -W0 -q -d1 /dev/hda
#}

but instead subsitute /dev/hdc for my DVD drive.

I thought the pound sign at the beginning of a line, meant that line would not be loaded, so I assume I'd need to remove the # sign.

Also, whats the -m16, WO, etc, mean?

Thanks
IGF

Caeda · 10-20-2006, 09:20 PM

No, just use the -d1, that should be all you need for dma. THe man file tells you that...