Medium Optical Disk (RW551/RW552) Library
6–14
EK–MOL80–SV. B01
The Multifunction Optical Drive and Drive Controller
Figure 6–6 Functional Diagram
There are four major sub-assemblies within the optical drive: the controller PCA,
servo PCA, loader mechanism, and the optical head.
Controller PCA
The controller PCA is a microprocessor-based collection of digital electronics
that handles functions performed by a SCSI controller, a data buffer, and a
formatter/sequencer.
SCSI Controller
The SCSI controller provides the SCSI interface connection to the host computer.
This interface consists of both the electrical signals and the firmware which
decodes the various commands and messages on the SCSI bus and instructs the
drive to take appropriate action.
