Miscellaneous > Technical Support
List CD write speeds or burning a CD properly
H_TeXMeX_H:
It's this one:
http://pcworld.about.com/news/Jun212002id102077.htm
1,1,0 101) 'ASUS ' 'CRW-4012A ' '1.0 ' Removable CD-ROM
40X/12X/48X
Still, I can ony safely burn at 4x :(
WMD:
Bah. Get some patience. I burn DVDs at 2x...and do I complain? Rarely. :D
mobrien_12:
Ok, so it's an IDE/ATAPI drive, but are you using SCSI emulation? I tried getting my ATAPI CD burner to work without SCSI emulation just to see how well the drivers worked, and everything was corrupted.
Here is a link with some good instructions to setting up SCSI emulation. http://www-128.ibm.com/developerworks/linux/library/l-cdburn.html
Only thing it doesn't mention is resetting your /dev/cdrom symbolic links and /etc/fstab...
Also, is your IDE controller using bus mastering on this drive? You can check it with hdparm.
H_TeXMeX_H:
Here's the output of cdrecord -scanbus:
--- Quote ---
[Drax@knoppix ~]$ cdrecord -scanbus
Cdrecord-Clone 2.01.01a03-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2005 J
--- End quote ---
mobrien_12:
--- Code: ---
[root@hariel mobrien]# /sbin/hdparm /dev/hdc
/dev/hdc:
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Inappropriate ioctl for device
--- End code ---
The "using_dma" is what you are looking for.
You are apparently not using SCSI emulation. Kernel 2.6 is supposed to have a much better ATAPI support, but I have never tried it. SCSI emulation is much more mature... and when you consider that ATAPI is essentially SCSI over the ATA interface anyway, it makes perfect sense.
If you are having problems, why don't you try SCSI emulation and see if it solves your problem?
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