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Teknologi Informasi
Evangs Mailoa (evangsmailoa.wordpress.com) Fakultas Teknologi Informasi UKSW
When people think about computer storage devices, the first thing that usually comes to mind is the internal hard disk drive. While this is the most common PC storage device, many forget about storage peripherals. These devices sit outside the computer and provide additional storage functionality. Whether you are looking to back up data, add more space to your system or transfer large files, there are a number of computer storage peripheral types available. www.ehow.com
Floopy disk drives (FDD) and Zip disk drives are rarely used nowadays but are common feature of older computers. Both devices are available as external peripherals for loading old files onto newer systems. Whereas a floopy disk only holds 1.44MB of data, a typical Zip disk holds 100MB. Basically, a floppy disk drive reads and writes data to a small, circular piece of metal-coated plastic similar to audio cassette tape.
The floppy disk drive (FDD) was invented at IBM by Alan Shugart in 1967. The first floppy drives used an 8-inch disk (later called a "diskette" as it got smaller), which evolved into the 5.25-inch disk that was used on the first IBM Personal Computer in August 1981. The 5.25-inch disk held 360 kilobytes compared to the 1.44 megabyte capacity of today's 3.5-inch diskette.
The 5.25-inch disks were dubbed "floppy" because the diskette packaging was a very flexible plastic envelope, unlike the rigid case used to hold today's 3.5-inch diskettes. By the mid-1980s, the improved designs of the read/write heads, along with improvements in the magnetic recording media, led to the less-flexible, 3.5-inch, 1.44-megabyte (MB) capacity FDD in use today. For a few years, computers had both FDD sizes (3.5-inch and 5.25-inch). But by the mid1990s, the 5.25-inch version had fallen out of popularity, partly because the diskette's recording surface could easily become contaminated by fingerprints through the open access area.
Hard disks were invented in the 1950s. They started as large disks up to 20 inches in diameter holding just a few megabytes. They were originally called "fixed disks" or "Winchesters" (a code name used for a popular IBM product). They later became known as "hard disks" to distinguish them from "floppy disk". Hard disks have a hard platter that holds the magnetic medium, as opposed to the flexible plastic film found in tapes and floppies.
At the simplest level, a hard disk is not that different from a cassette tape. Both hard disks and cassette tapes use the same magnetic recording techniques. Hard disks and cassette tapes also share the major benefits of magnetic storage -- the magnetic medium can be easily erased and rewritten, and it will "remember" the magnetic flux patterns stored onto the medium for many years.
As the name implies, external drives sit outside the computer and provide the same functions as internal drives. External DVD burners plug into a USB port on your PC and allow you to write data to DVD discs, for example. External USB and FireWire hard drives are also available that provide as much as 2TB of storage.
Flash Media (flashdisk) devices, such as USB thumb drives and memory cards, are the most common computer storage peripherals. Because they are so small, they are handy for moving files between computers or backing up a small set of important files. A typical flash driver or memory card holds 1GB to 64GB of data.
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