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

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CD-R / CD-RW
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 SCSI
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CD-ROM / CD-RW Interfaces

Like any other device in a PC, CD-ROM drives need a way of interfacing with the PC. The most common interface used is an IDE channel, using a 40-pin ribbon cable. However, many other interfaces can be used. Most CD-ROM drives interface with a PC via:

  • IDE (ATAPI)

  • SCSI

  • USB or IEEE 1394

  • ATAPI

The AT Attachment Packet Interface, or ATAPI interface is the most common interface used in CD-ROMs. This interface protocol allows CD-ROM drives to be attached to regular IDE controllers and are normally used by hard disk drives. ATAPI CD-ROM drives are commonly referred to as 'IDE CD-ROMs.'

Because regular IDE command sets cannot be used to control a CD-ROM, the ATAPI protocol was developed and is basically a derivative of the standard IDE command set. The software driver for a CD-ROM is generically known as an ATAPI-compatible

CD-ROM driver. By attaching a CD-ROM drive to an IDE channel, the drive itself must be configured as a master or slave of that channel. Typically CD-ROM drives come from the manufacturer configured as a slave device by default.

Figure 76: IDE CD-ROM with ribbon cable and power connector

 

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