Hard disks are random access digital magnetic data storing
devices. They have rotating rigid platters that have data
magnetically read from or written to by read or write heads
floating above the platters. Over the years, hard disk drives
have decreased in price and size while increasing in capacity
considerably. Hard disk drives have been the device principally
used for storing secondary data in computers for a long time
now. They have kept up with the requirements for secondary
storage and therefore have survived the sweeping technology
changes of the times. Today’s hard disk drives are often
portable and operated on by high-speed serial interfaces.
External removable hard disks or portable hard disks are popular
now because they provide independence from system integration,
and establish connection via options such as USB. The plug and
play drive feature provides form system compatibility. Portable
hard disk drives have the ability to function and allow
themselves to be removed simply. They have impressive