Interfaces
Below are the different types of Interfaces that allow a CD-ROM and other disc drives to connect to the computer.
- IDE / ATA - One of the most commonly used interfaces used still today to connect disc drives to the computer.
- Panasonic - Older proprietary interface.
- Parallel - Interface used with old external CD-ROM drives.
- PCMCIA (PC Card) - Interface sometimes used to connect external disc drives to laptop computers.
- SATA - Quickly replacing IDE as the new standard to connect disc drives.
- SCSI - It is highly recommended to get a card that matches the CD-ROM drive as some of the earlier drives had proprietary SCSI interfaces. Otherwise, a SCSI-2 card is recommended.
- USB - Interface most commonly used to connect external disc drives.
Below is the standard transfer rates and access times of the majority of CD-ROM drives. The below figures are averages you can expect to find on each speed of CD-ROM drive. These averages may be slower or faster than your CD-ROM drive and to where the CD-ROM is accessing the data from the CD-ROM. In general the higher this number is the faster the transfer rate or in the case of a disc burner the faster the write rate.
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 |
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