CD Burning very slow

njbrain · 06-29-2006, 10:14 PM

I am buring audio CD's with k3b/cdrecord, and it only goes at 12x with an empty buffer the whole time. If I manually set the buffer to 64mb, it burns at 24x until the buffer runs dry, and then it slows right back down. I have this problem even when I run it under root. I have the same problem whether I use my IDE or USB 2.0 drive. This is very annoying because I am making these audio CD's for my church, and I have about 150-200 to make.
Thanks, Noah

x86processor · 06-30-2006, 03:01 AM

What hardware? Which CD-drive? Which distro?

minrich · 06-30-2006, 07:19 AM

What sort of blank CD's?

What does # hdparm /dev/hdc (as root) give you?

njbrain · 06-30-2006, 08:26 AM

I have and AthlonXP 2400+ with 512 megs of ram, and a 300gb 7200 rpm hdd. My cd burners are a 52x32x52 ide, and 16x8x16x48x dvd/cd usb 2.0. I am using Magnovax 52x cdrs. If I direct copy from one drive to another, then it will go full speed.

root@Sagasto:/home/njbrain# hdparm /dev/hdc

/dev/hdc:
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Invalid argument
root@Sagasto:/home/njbrain#

minrich · 06-30-2006, 09:23 AM

njbrain

My hdparm is same as yours except: 'readahead = 1024 (on)' for both /dev/hdc and /dev/hda perhaps you should read up on hdparm, and/or man hdparm. I am not sure how to amend the readahead setting, but it may be the reason that you have an empty buffer. That said, I am not sure how Slackware deals with bsuch things -- my expereience with k3b has been excellent even writing SUSE dvd isos to DVD-RAM disks at 4x automatically.