A hard disk drive is a non-volatile storage device that retains data even when power is removed. It contains spinning magnetic disks and a drive head that reads and writes data to the disks. In 1961, IBM introduced one of the first disk drives about the size of a washing machine that could store 2 million characters. By the 1980s, hard disk drives became standard features on PCs as their costs decreased significantly.

1. Presented by-
Sudeep pandey
Roll no -:16

2.  Hard Disk Drive is non volatile data storage
device,it means that the storage device
retains the data even when no power is
supplied to the computer.
 The device usually consists of several
motorised magnetic disks and a motorised
drive head to read and write information. The
device just cased in an aluminium casing to
protect the delicate parts


3.  In 1961 IBM introduced the model 1311 disk drive
,which has about the size of washing machine and
stored two millions character.
 As the 1980 began ,HDDs were a rare and every
expensive additional features on pcs ,however by the
late 1980’s,their cost had been reduced to the point
where they were standard on all but the cheapest pc

4.  Large storage capacty
 Sensitive instruments
 Thick
 Cheap
 Faster than floppy and CD Rom
 Store programs ,operating systems ,and
personal files
 Data is conserving and doesn’t even we sitch
the computer off

5.  Internal Hard Disks
 External Hard disk

6.  An internal hard drive is the primary storage
device located inside a computer system .it
usually contains pre installed software
applications ,the operating systems and other
files . Most desktop computers have several
internal hard drive allowing them to provide
greater data storage .on the other hand laptop
computers can only accommodate one internal
had drive ,forcing the users to add an external
storage device to store data that exceed the
laptop’s internal capacity.

7.  EIDE
 SATA
 SCSI

8.  It has a 40 pin connector.
 Data transfer rate is 133 mbps
 When installed this type of hard drives ensure that the
jumpers are correctly configured
 If you have two devices connected to one ide controller .(one
must be set to master and other must be set to slave.

10.  It has a 7pin connector
 It is the latest high speed type of hard rive connectors
 Data transfer rate is 300 mb/s. as there a faster than old IDE
interface
 The latest hard hard drives are using this type of interface
 As there are faster thhan old IDE interface

12.  It has a 50 or 68 pin connector
 The data transfer rate is 600 mb/s
 Thesse requires a SCSI adapter card
connector into the system
 Nowadays ,most desktop computers did not
use the SCSI.

13.  It is a storage device located outside of
computer that is connected through usb
cable or wireless connection.
 Two interface are usually used y this storage
device : firewire or usb.The diffrence between
these is the rate at which data can be
transferred.USB connection can move data at
a rate of 12 to 480 mbps. while firewire
supported external devices boast
transmission from 400 to 800 mbps.

14.  A hard disk has revolutionised the digital age
as we know it .hard disks are the most widely
used technology for storage of our
information data .Without hard disk the
computer digital age we live in would not be
the same

15. 