CD ROM
https://letsknowaboutcomputer.blogspot.com/2011/10/cd-rom.html
Compact Disc-Read Only Memory, CD-ROM drives or optical drives are CD players inside computers that can have speeds in the range from 1x and beyond.
Max mean on 24x max CD-ROM drive?
CD-ROM drives that are over 16x will generally have max written next to it. When max is written next to the speed or on the drive, this indicates that the CD-ROM uses CAV, or Constant Angular Velocity, to access the data on the CD. Originally, CD-ROM drives utilized CLV, or Constant Linear Velocity, where the information was accessed slower / faster by adjusting the speed of the motor, which allows the data to be transferred at a steady flow.
With CAV, the CD rotates at a constant speed without adjusting when at a different location on the CD, which means a 32x speed CD-ROM, for example, will be able to access the data 32x on the outside layer, however, when approaching the middle of the CD-ROM drive, the access speed can decrease close to 20x.
| Drive speed | Transfer rate (BPS) | Access time (ms) |
| Single-speed (1x) | 153,600 | 400 |
| Double-speed (2x) | 307,200 | 300 |
| Triple-speed (3x) | 460,800 | 200 |
| Quad-speed (4x) | 614,400 | 150 |
| Six-speed (6x) | 921,600 | 150 |
| Eight-speed (8x) | 1,228,800 | 100 |
| Ten-speed (10x) | 1,536,000 | 100 |
| Twelve-speed (12x) | 1,843,200 | 100 |
| Sixteen-speed (16x) | 2,457,600 | 90 |
| Eighteen-speed (18x) | 2,764,800 | 90 |
| Twenty-four-speed (24x) | 3,686,400 | 90 |
| Thirty-two-speed (32x) | 4,915,200 | 85 |
| One-hundred-speed (100x) | 15,360,000 | 80 |
| CAV drives (12x - 24x) | 1,843,200 - 3,686,400 | 150-90 |
