Memory on hard drive
A hard drive which is often called as hard disk, hard drive or HDD is a non-volatile storage device that stores digitally encoded data, The data is encoded on rapidly rotating platters with magnetic surfaces. Early hard disks had removable media but however, today’s hard disk is typically a sealed unit with fixed media. HDDs (introduced in 1956 as data storage for an IBM accounting computer[7]) were originally developed for use with general purpose computers. the data recording is done by magnetizing ferromagnetic material directionally, to represent either a 0 or a 1 binary digit. They read the data back by detecting the magnetization of the material.
A typical HDD design consists of a spindle that holds circular disks called platters, onto which the data is recorded. The platters are made from a non-magnetic material, and are coated with a thin layer of magnetic material, typically 10-20 nm in thickness with an outer layer of carbon for protection. The platters are spun at very high speeds. Information is written to a platter as it rotates past devices called read-and-write heads that operate very close over the magnetic surface. The read-and-write head is used to detect and modify the magnetization of the material immediately under it.
A Hard drive has a reputation for the potential of catastrophic “crashing” with such failure leading to a total data loss, however they continue to be a popular component of computers because the hard drives are much cheaper than solid state drives.
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