It's about the hard disk definition, features, types and the disadvantage of hard disk.

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Hard Disk

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Hard Disk Definition
 Hard disk is part of a unit, often called a "disk drive - hard drive
or hard disk drive”, which stores and provides relatively quick
access to large amounts of data on an electromagnetically
charged surface or set of surfaces.

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Hard Disk Features
 Large storage capacity
 Sensitive instruments
 Thick
 Cheap
 Metallic platters for storage
 Faster than floppy diskette and CD-ROM
 Store programs, operating systems, and personal files
 Data is conserving and doesn’t even we switch the computer off
 Usually fixed inside the computer so cannot get mislaid

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Hard disk types
There are three types of hard disks:
 Digital Versatile Discs
 External Hard Disks
 Internal Hard Disk

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Hard Disk Disadvantages
 Hard disks eventually fail, which stops the computer from
working.
 Regular 'head' crashes can damage the surface of the disk,
leading to loss of data in that sector. Head crash is a disaster.
 The disk is fixed inside the computer and cannot easily be
transferred to another computer.
Materials that Cause a Head Crash