Looking To Buy An External Hard Disk ?. Some Valuable Info.
History Of The External Hard Disk
The earliest external hard disk was enormous. 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 genuinely earned the name external hard disk. Due to insufficient capacity these types of external hard disks were swappable so the large mainframe computer could get 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 computers using Windows, while external hard drives continued to be popular for much longer on the Apple Macintosh as well as other professional workstations which offered 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 PC market also. These new interfaces supplanted the more complex and high-priced SCSI interfaces, resulting in standardization and cost reductions for the external hard drive.
The internal structure of external hard disk drives resembles standard hard disk drives; in fact, they include a normal hard disk drive that 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 keeps the platters and moving heads of traditional hard drives they are much less tolerant of physical shocks than flash-based technology (a fact often overlooked by customers lulled into a false sense of ruggedness by their styling).
Larger models often include full-sized 3.5″ PATA or SATA desktop hard drives, are available in the same size ranges, and typically carry a similar cost. More pricey models, especially drives with biometric security or several interfaces, generally cost considerably more per gigabyte. Smaller, portable 2.5″ drives intended for laptop and embedded devices are a bit more expensive in cost per GB in contrast to larger capacity 3.5″ drives. Small MP3 players, previously built around mechanical hard drive technology are now primarily solid state CompactFlash based devices.
If you are seriously looking at a external hard disk visit http://500gbportableharddrive.org This useful website has information on all the models and the best prices on the web AND you can purchase with 100% confidence.
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