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diff --git a/DOCS/CDROM b/DOCS/CDROM new file mode 100644 index 0000000000..f45cb883b2 --- /dev/null +++ b/DOCS/CDROM @@ -0,0 +1,45 @@ + +Tune up CDROM +~~~~~~~~~~~~~ + +Introduction +~~~~~~~~~~~~ +>From Linux documentation: + +Some CDROM drives are capable of changing their head-speed. There are several +reasons for changing the speed of a CDROM drive. Badly pressed CDROMs may +benefit from less-than-maximum head rate. Modern CDROM drives can obtain very +high head rates (up to 24-times is common). It has been reported that these +drives can make reading errors at these high speeds, reducing the speed can +prevent data loss in these circumstances. Finally, some of these drives can +make an annoyingly loud noise, which a lower speed may reduce. + +Howto +~~~~~ +The recommended way to do it is with a program called 'setcd' . It's kinda +old, but won't be too hard to find on the Net. +Use it with : + setcd -x <speed> <cdrom device> + +Also you can try : + echo current_speed:4 >/proc/ide/<cdrom device>/settings +but you'll need root privileges. (It didn't work for me - Gabucino) + +I use following command too : + echo file_readahead:2000000 >/proc/ide/<cdrom device>/settings +for 2MB prefetched reading from the file (it's useful for scratched CDROMs). + +It's recommended that you tuneup your CDROM drive also with hdparm: + +hdparm -d1 -a8 -u1 <cdrom device> +to enable using DMA access, readahead, and IRQ unmasking. +(if you don't understand these, *read the hdparm manpage*) + +Final words +~~~~~~~~~~~ +Please refer to "/proc/ide/<cdrom device>/settings" for fine-tuning your CDROM. + + Nick Kurshev & Gabucino + <nickols_k@mail.ru> + + |