Miscellaneous > Technical Support
List CD write speeds or burning a CD properly
H_TeXMeX_H:
Here is hdparm output:
--- Quote ---
[Drax@knoppix ~]$ /sbin/hdparm /dev/cdwriter
/dev/cdwriter:
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
[Drax@knoppix ~]$
--- End quote ---
How do you use SCSI emulation ?
mobrien_12:
To use scsi emulation, assuming your burner is on /dev/hdc.
Edit your grub.conf file.
Copy your linux entry. Call the copy something different, like linuxscsi.
Add an entry at the end of the kernel line saying
hdc=scsi
Reboot and use the new entry. Your burner is no longer accessable under /dev/hdc at all. Instead, it is accessible as /dev/scd0. Reset your /dev/cdwriter symlink appropriately.
cymon:
Ugh. SCSI emulation over IDE, that's just unholy. Luckily for me, I don't need any emulation.
mobrien_12:
--- Quote from: cymon ---Ugh. SCSI emulation over IDE, that's just unholy. Luckily for me, I don't need any emulation.
--- End quote ---
As I said before, the whole ATAPI specification is already essentially SCSI over IDE.
The only emulation that's going on is the way the kernel interfaces with the drive.
There's nothing unholy or unnatural about it.
The new kernel 2.6 drivers which allow you to avoid the ide-scsi really only offer convenience in setup.
H_TeXMeX_H:
Well it don't work ... the writer drive is hdd and I put hdd=scsi in the kernel line, and hdd dissapeared, but /dev/scd0 did not appear :(
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