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There are two types of CD-ROM drives we can mod: 24x to 40x 40x or higher Drives slower than 24x are too old to be modded. 24x to 40x CD ROMs Laser Head Adjustments: The track pitch of CDs is 1.6 microns, and the track pitch of DVDs is only 0.8 microns. The minimum length of track pits of CDs is...