Planning To Buy An External Hard Disk ?. Some Useful Info.

Back Ground Of The External Hard Disk

The earliest external hard disk was enormous. Quite possibly 100 times bigger than todays and only capable of holding just a few megabytes of data !. In those days info was held externally to the computer so it truly earned the name external hard disk. Due to the lack of capacity these external hard disks were swappable so the large mainframe computer could have access to more data.

The External hard Disk Today

With the end of the 20th century, internal drives took over as the system of choice for computer systems using Windows, while external hard drives continued to be common for much longer on the Apple Macintosh and other professional workstations which supplied external SCSI ports. Apple made such interfaces available by default from 1986 and 1998. The addition of USB and Firewire interfaces to standard personal computers led those drives to become commonplace in the Desktop market as well. These new interfaces supplanted the more complicated and high-priced SCSI interfaces, bringing about standardization and cost reductions for the external hard drive.

The inner framework of external hard disk drives resembles normal hard disk drives; actually, they include a normal hard disk drive which is mounted in a disk enclosure. For an external hard disk now the capacities range from 160 GB to 4TB and the cost per gigabyte varies between .15 and .40 USD.

As an external hard disk retains the platters and moving heads of conventional hard drives they are much less tolerant of physical shocks than flash-based technology (a fact often overlooked by people lulled into a false sense of ruggedness by their styling).

Larger types often include full-sized 3.5″ PATA or SATA desktop hard drives, can be found in the same size ranges, and generally carry a similar cost. More pricey models, particularly drives with biometric security or multiple interfaces, usually cost considerably more per gigabyte. Smaller, portable 2.5″ drives created for laptop and embedded devices are slightly more expensive in cost per GB compared with larger capacity 3.5″ drives. Small MP3 players, previously built around mechanical hard drive technology are now primarily solid state CompactFlash based devices.

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