With the Kenwood 40X TrueX CD-ROM drive, the speed remains 40X regardless of whether it is reading from the inside or outside track. With a constant speed of 40X, the Kenwood 40X CD-ROM is able to achieve sustained high transfer rates.??What distinguishes the Kenwood 40X CD-ROM drives from typical CD-ROM drives is the use of the Zen TrueX Technology. Instead of utilizing only 1 laser beam to read CDs, Zen TrueX allows the use of 7 beams. Like typical CD-ROMs, the Kenwood uses only 1 beam to track the data, however, there are an additional 6 beams, which are used to read the data. Since essentially 7 tracks can be read simultaneously, the transfer rates of the Kenwood are extremely high.