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An external hard drive enclosure that uses a 2.5-in drive and a USB connection for power and transfer. Key benefits to using external disk enclosures include: Adding additional storage space and media types to small form factor and laptop computers, as well as sealed embedded systems such as digital video recorders [1] and video game consoles. [2]
Additionally, the larger 3.5" drive will get the 12 V it needs to power its disk spindle motor. Thus a bare hard drive may be attached directly to the computer, powered by the unique cable, where it will run at full SATA speeds, without the necessity of placing the hard drive into an external enclosure.
Historical Word serial interfaces connect a hard disk drive to a bus adapter [b] with one cable for combined data/control. (As for all early interfaces above, each drive also has an additional power cable, usually direct to the power supply unit.) The earliest versions of these interfaces typically had an 8 bit parallel data transfer to/from ...
A typical DAS system is made of a data storage device (for example enclosures holding a number of hard disk drives) connected directly to a computer through a host bus adapter (HBA). Between those two points there is no network device (like hub, switch, or router), and this is the main characteristic of DAS.
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 ...
Hard drives in modern computers are typically mounted in fully internal 4″ (nominally 3.5″) bays. Most modern computers do not come with a floppy drive at all, and may lack any externally accessible 3.5″ bays. There are adapters, sometimes called a "sled", which can be used to mount a 3.5″ device in a 5.25″ bay.
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