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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0110:  Removable Media
      9  IV  CD-ROM
           9  CD-ROM / CD-RW Interfaces

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SCSI

A second interface used for connecting a CD-ROM to PC is the SCSI interface. SCSI CD-ROM drives have much higher performance than their ATAPI competitors, but are less common due to the substantially higher cost of SCSI technology.

As you learned in Chapter 0101, devices on the SCSI chain are controlled completely by the SCSI adapter.

Therefore, when performing operations that require a read from one device with a simultaneous write to another device, SCSI outshines IDE.

This becomes even more critical when using a CD-RW device that requires the uninterrupted data flow from the source of the data (a hard disk or another CD-ROM drive) to the CD-RW.

What this means is that if you're using an IDE/ATAPI CD-RW, you are forced to not perform any other operations or run any programs during the burn operation.

However if you're using a SCSI CD-RW, the data transfer is completely controlled by the SCSI adapter and in turn frees up the rest of the system to do other things.

[spacer]Early CD-ROM Interfaces

In the early days of the CD-ROMs, manufacturers packaged the drives in what were known as multimedia kits. These kits typically included a sound card, a CD-ROM drive, and maybe a set of speakers. At the time the most natural way to interface the CD-ROM with the rest of the system was to attach it to the sound card that came with the kit. Of course this led to a slew of proprietary interfaces for CD-ROM drives that were not interchangeable with other sound cards. The biggest players during this time were Creative Labs, Sony, and Mitsumi. These proprietary interfaces eventually went away we're left today with two standard interfaces, ATAPI and SCSI.



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