CD-ROM drives

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CD-ROM drives

Most optical drives today are combo CD/DVD drives that support DVDs and all the CD formats: CD audio, CD-ROM, CD-R and CD-RW. The speeds of the drives are rated by their CD-ROM and DVD transfer rates. The original CD-ROM drive (1x) transferred data at 150KB per second. By doubling the spindle RPMs, the data transfer rate increased to 300KB/sec (2x) and so on. See CD-ROM and DVD drives.

CD-ROM      CD-ROMX Rating    Data Transfer Rate

      1x       150 Kilobytes/sec
      2x       300 Kilobytes/sec
      4x       600 Kilobytes/sec

      8x       1.2 Megabytes/sec
      10x      1.5 Megabytes/sec
      12x      1.8 Megabytes/sec
      20x      3.0 Megabytes/sec
      36x      5.4 Megabytes/sec
      40x      6.0 Megabytes/sec
      48x      7.2 Megabytes/sec
      50x      7.5 Megabytes/sec
      52x      7.8 Megabytes/sec

What Does 40x/12x/48x Mean?
CD drive ratings are designated with three speed numbers such as 40x/12x/48x or 40/12/48, as follows:

First X     /  Second X     /  Third X
  CD-R write  /  CD-RW write  /  CD-ROM read

A Lot of X's
This is the label from a Memorex combo CD/DVD drive. Each "X" number means X times 150KB for CDs and X times 1.39MB for DVDs.
References in periodicals archive ?
Products include a line of award-winning high performance TrueX CD-ROM drives -- 42X TrueX, 52X TrueX, 52X TrueX SCSI, and 72X TrueX
For running multimedia programs, you'll want a 4X to 8X CD-ROM drive with stereo speakers.
The other was the 9240, with a 133-megahertz chip, the writeable CD-ROM drive and a 1.
The P5-100XL comes in a tower case and includes the quadruple-speed CD-ROM drive, 17-inch Vivitron monitor, ENSONIQ's 16-bit wavetable sound card, Altec-Lansing ACS-31 speakers with subwoofer, 16MB of RAM, 1GB enhanced IDE hard drive and a high-performance PCI local bus video card with 2MB video RAM.
Corel CD PowerPak transparently supports both SCSI (Small Computer Systems Interface) and non-SCSI CD-ROM drives under Windows(TM) and DOS.
Both the TrueX CD-ROM drives and the speakers will be sold through these retail and distribution channels under the Kenwood brand name.
The AppleCD 300 is designed to transfer data up to twice as fast as most CD-ROM drives and is equipped with a large 256K data buffer.
Compaq recognizes the significant performance differentiation available from Kenwood CD-ROM drives based on Zen's TrueX technology.
Bundled with the critically acclaimed Mirror CD-ROM drive, CD Stock offers immediate access to the largest collection of digitally stored stock photographs ever available from leading stock agencies.
For example, to business travelers, it means not having to carry CDs and external CD-ROM drives with their laptops and risk damage to master CDs," she said.