From the hdparm man page:

-E Set cdrom speed. This is NOT necessary for regular operation, as the drive will automatically switch speeds on its own. But if you want to play with it, just supply a speed number after the option, usually a number like 2 or 4. FYI, I have never tried this and don't know how well this actually works. It might very well be that some CDR(W) drives ignore the command. On Wednesday 11 December 2002 08:16, Alexandr Malusek wrote:

How can I set the maximum speed for reading data?

-- Karol Pietrzak PGP KeyID: 3A1446A0