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Optical drives for computers come in two main form factors: half-height (also known as desktop drive) and slim type (used in laptop computers and compact desktop computers). They exist as both internal and external variants. Half-height optical drives are around 4 centimetres tall, while slim type optical drives are around 1 cm tall.
The SCSI ID of a device in a drive enclosure that has a back plane is set either by jumpers or by the slot in the enclosure the device is installed into, depending on the model of the enclosure. In the latter case, each slot on the enclosure's back plane delivers control signals to the drive to select a unique SCSI ID.
Parallel ATA (PATA), originally AT Attachment, also known as Integrated Drive Electronics (IDE), is a standard interface designed for IBM PC-compatible computers.It was first developed by Western Digital and Compaq in 1986 for compatible hard drives and CD or DVD drives.
SCSI hard drives showing 80-pin SCA connector (top), and separate 68-pin and power connectors plus configuration jumpers (bottom) SCSI backplane with 80-pin SCA connectors. Hard Drives are mounted on proprietary hot-swappable caddies. Single Connector Attachment, or SCA, is a type of connection for the internal cabling of Parallel SCSI systems ...
The drives within an A-unit and all other drives in a string had interfaces similar to the early interfaces, above. A-units connected to IBM Directors or integrated attachments . Small Computer System Interface (SCSI) , originally named SASI for Shugart Associates System Interface, is an early (circa 1978) industry standard interface explicitly ...
Jumper pins (points to be connected by the jumper) are arranged in groups called jumper blocks, each group having at least one pair of contact points.An appropriately sized conductive sleeve itself called a jumper, or more technically, a shunt jumper, is slipped over the pins to complete the circuit.
However, not all optical drives provide this capability, and support for this feature can vary significantly between manufacturers and drive models. On drives lacking raw data access, users may rely on a less precise method: monitoring unexpected reductions in read speed, though this is a far less reliable indicator of disc health.
SCSI Multimedia Commands (MMC) is a standard defining a SCSI/ATAPI based command set for accessing and controlling optical disc readers/writers (any device of type 05h). ). Thus, optical drives for the compact disc, DVD, and Blu-ray disc fall under this specific