The hard drive is a hard worker system PC.
The dishes that store the data begin to spin rapidly
so the computer is turned on (except in the case of portable PCs, which periodically turn off the disk to save
battery).
Each operation of the disk drive to read or write a file triggers a sequence of movements absurd - that
should be performed with microscopic precision by heads read / write.
The settings of a hard drive obey
such accuracy - the intervals between the heads and the dishes are so small that they do not include a hair - is
fantastic as the unit can play so well its task without constant damage.
Instead, it remains in order,
working for many years and presenting very few flaws.
The capacity, shape and performance of hard disk drives have changed dramatically since the onset of the first
IBM XT hard drive, in the early 80s.
At that time, 10 megabyte capacity was considered generous.
The hard disk drive had 3 to 4 inches wide and occupies a space similar to a unit of
5 1/4 inches.
The access time of 87 milliseconds was then superfast, compared to the access time of floppy disk drives.
A decade later, the hard drives that hold 200 megabytes, with the smaller size of a disk drive
3 1/2 inches and access speed of 18 milliseconds, are cheap and supercomuns.
More recent still, the models
removable 20 megabytes or more are no bigger than a matchbox.
In the future, the size of the units
continues to decrease further as the storage capacity increases.
Certainly, one thing about the hard drives remain.
Unlike any PC components that meet the
program commands without complaint, the hard drive vibrates and beeps while you are doing your job.
Those
noise allow you to remember the hard drive as one of the few components in PCs that is both
mechanical and electronic.
The mechanical components of the unit often make things happen.
Source: Evolution of Computers
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