What is Hard disk?
A hard disk is part of a unit called a hard
drive or hard disk drive that stores data and
provides relatively quick access to large amounts of data on an electromagnetically
charged surface or set of surfaces. Today's computers typically come with a
hard disk that can contain anywhere from billions to trillions of bytes of
storage.It is available randomly up to 4 TB.
OR
The hard drive is a
drive which stores all your data. Hard
disk is the house, where all your files and folders are physically located. A
typical hard drive is only slightly larger than your hand.
The term "hard
drive" is actually short for "hard disk drive." The term
"hard disk" refers to the actual disks inside the drive. However, all
three of these terms are usually seen as referring to the same thing -- the
place where your data is stored. Since I use the term "hard drive"
most often, that is the correct one to use.
The data is stored
on a stack of disks that are mounted inside a solid encasement. These disks
spin extremely fast (typically at either 5400 or 7200 RPM) so that data can be
accessed immediately from anywhere on the drive. The data is stored on the hard
drive magnetically, so it stays on the drive even after the power supply is
turned off.
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It was introduced in 1956 by IBM.
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Randomly its capacity range
from 40gb to 4 TB.
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5400 rpm can transfer data 200MB/sec.
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7200 rpm can transfer data 150MB/sec.
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Revolution per minute (rpm) is a rotation of disk.
What kind of hard
disk is?
A small hard drive has only one
platter, but each side of it has a magnetic coating. Bigger drives have
a series of platters stacked on a central spindle, with a small gap in between
them. The platters rotate at up to 10,000 revolutions per minute (rpm) so the
read-write heads can access any part of them.
