What does speed of a cdrom mean

CD-ROM Drive speeds are written in the form of a number followed by an X. The number is a representation of the transfer rate of the drive (how fast the drive can read data from a CD). Standard transfer rates are 150KB/s (kilo-bytes per second) for every X value. To find your optical drives bps speed simply multiply its rating by the 150 KB/s factor. Some sample drive speeds are:
DRIVE SPEED KB/s MB/s
Single-speed (1x) 150 0.146484375
Double-speed (2x) 300 0.29296875
Ten-speed (10x) 1500 1.46484375
Twenty-four-speed (24x) 3600 3.515625
Thirty-two-speed (32x) 4800 4.6875
Forty-Eight-speed (48x) 7200 7.03125
Fifty-Two-speed (52x) 7800 7.6171875

KB/s = Kilo-Bytes per second
MB/s = Mega-Bytes per second
1X = 150 KB/s = .146 MB/s

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