You can decrease read speed for an optical drive if this later makes an annoying buzzing sound while watching a DVD, for example.
Under Ubuntu 11.04/10.10/10.04, launch the Terminal and run first this command to know the maximum read speed for your CD/DVD-ROM drive:
eject -X
To set CD/DVD read speed, then issue this command:
eject -x n
Replace n with the new read speed you want to apply. Here are some examples:
eject -x 32
eject -x 16
eject -x 8
eject -x 4
This command has also the same function (change 16 with any read speed of your choice):
eject -x 16 /dev/cdrom
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