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