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Different Types Of PC Hard Disk Drives (HDD)

Hard Disk Drive:        Hard disk is an important part in pc which stores all software's ( including OS and Application software), user data, files and folder. It is a permanent memory storage type which can retain data after power interruption.

Why it is called Hard Disk Drive:    It is made up of concentric metallic disk fitted at a Spindle, bunch of head each placed one after the other to read data from both the side of each disk. These metallic disks are coated with magnetic material to store data. Since these disks are made up of hard metallic substance so it called hard disk.

Different type of HDD:      Mainly five types of HDD available in market.
1.    IDE : Integrated Drive Electronics. IDE drives are also known as PATA drives( Parallel advance technology attachment )
2.    SATA : Serial advance technology attachment
3.    SCSI : Small Computer System Interface. SCSI is pronounced as scuzzy.
4.    SAS : Serial Attached SCSI
5.    External removable Hard Disk Drive

IDE / PATA (Integrated Drive Electronics Drive / Parallel Advance Technology Attachment Drive)
•    IDE/PATA Drives have usually 40 pins.
•    IDE/PATA Drives offer 133 MB/sec transfer rate.
•    It sends 8 bit data at a time.
•    PATA Cables are used to connect PATA HDD. Two drives can be connected in a single pata cable. One as master and other as slave. The configuration of master and slave is done by different combination of jumpers in the hdd.

SATA (Serial Advance Technology Attachment Drive)
•    SATA Drives have usually 7 pins, 4 pins in pair of two for sending and receiving data and rest 3 pins are grounded.
•    SATA Drives offers generally 300MB/sec transfer rate.
•    It sends data bit by bit.
•    SATA Cables are used to connect SATA HDD. Only one drive can be connected in a single sata cable.

SCSI (Small Computer System Interface Drive)
•    SCSI Drives have usually 50 to 68 pins.
•    SCSI Drive offers generally 640MB/sec transfer rate.
•    This drives are hot swappable (means it can be attached or detached from system in running condition) 
•    SCSI cables are used to connect SCSI HDD. Maximum of 16 drives can be connected in a single scsi cable. Each hdd have a 8 bytes hexadecimal code known as WWN (world wide name) for its identification in the cable.

SAS(Serial Attached SCSI Drive)
•    SAS Drives generally offers 805 MB/sec transfer rate.
•    This drives are hot swappable.
•    SAS Cables are used to connect SAS Drives. Maximum of 128 drives can be connected in a single sas cable.

External removable HDD
This is the hard disk drives external to system typically connect via USB cable. It is removable in nature and features large storage options and portable design.
It can be use for :
•    Backup
•    Data storage
•    External boot disk for system
•    Data cloning/recovery

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