CD-ROM drives


Also found in: Dictionary, Thesaurus, Medical, Financial.

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.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Three top CD-ROM drives that have earned best buy ratings from PC World magazine are NEC's CDR-73M, Toshiba's TXM-3301E and Sony's CDU-7205 Laser Library.
Bassick High School in Bridgeport, Conn., utilizes a CD-ROM drive in its graphics arts lab.
The same telephone directory that previously needed three or four CDs to hold it can now fit easily on a single 4.7GB DVD-ROM disk; and read-only DVD-ROM drives, which cost only about $100 more than CD-ROM drives, can also read CD-ROMs and CD-Rs and CD-RWs.
These technical data are quite comparable to those of mainstream CD-ROM drives sold today.
On the other hand, many of the high-speed CD-ROM drives are so inexpensive (below $100) that it is worth buying one if you have multimedia applications or if you install a lot of applications from CD-ROMs The trick is to know where to buy, as the price of the very same CD-ROM drive can be twice as-much at one dealer as at another.
But with the REXAS Super CD-ROM Server system, there is nearly unlimited potential in CD-ROM drive connectivity through networks or standalone PCs.
You don't learn the brand or model name of your CD-ROM drive, let alone its average access time of buffer size.
Netserve/CD 2400 pricing starts at $14,995 for a 24-drive system with 8x hot-swappable CD-ROM drives and 32 MB of RAM.
A Maxtet/CD 800 CD-ROM server with eight 12x hot-swappable CD-ROM drives is priced at $5,995.
CD-ROM drives are placed in 19-inch "rack units." Each drive within the server is hot-swappable, so that the drive can be replaced without bringing down the system.
Because TopSpin 120 appears to Windows, OS/2, and DOS clients as a familiar NetWare server, users require little or no training to access the server's seven CD-ROM drives or towers, the company says.
Available immediately through resellers, the caddy-based CD Tower-Rex sells for a street price of $56,928 and the tray-based CD Tower-Rex sells for $56,008 when fully loaded with 56 eight-speed CD-ROM drives.