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Tuesday, September 22, 2009

Different types of Hard Disk Drive


Hard Disk Drive - It is a non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surface. 

Types of HDD :
  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


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. 
  • 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.


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31 comments:

Anonymous said...

Not Bad Buddy! Keep the Good Work Up!
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Jessica said...

Really great explanation.
Helpful for me.
keep it up

Jessica said...

I hope you share more about it.

Biti said...

I will friends, thanks for supporting me

joeyjuviyani said...

Disk drives for Serial-Attached SCSI (SAS) is distinguished by easy installation procedure. To ensure proper operation of these drives, you don't need to install any jumpers, terminators, or other settings. Read more from the guide on How to Install the SAS hard disk drive at: http://forums.techarena.in/guides-tutorials/1294004.htm

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katty said...

I had a problem with my hard disc few time ago, how ever i could solve the problem and now my computer is really nice. after that i could see costa rica homes for sale and i loved too much because i always have been interested in visit this beautiful country.

rAms said...

thanx good job

jagadeesh said...

very helpful

dell inspiron mini 10 said...

Once known as the Winchester drive, the hard disk or hard drive is an essential hardware that every computer desktop and server contain. And its functionality, is to store vast amount of digital data in a non-volatile form, so that data can be retained when the computer is powered off. Data is again accessed when the power is on.
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meen said...

thanks for provides information

Anonymous said...

Are you sure that SCSI hard drives can get up to 640 mb/s because everywhere that I've read says it's 80 mb/s. Good job anyway

dipak kanade said...

thanks for provides informations

Anonymous said...

really helpful... apt points...

Viagra said...

Thank you for explaining the differences between these hard disk drives.

Anonymous said...

buddy great explanations but u missed SSD Hard disk(Solid state Drive ) which used in Laptop

Anonymous said...

what a great graphical representation. keep it up.

renaissance hotel pittsburgh pa said...

Really a Very Helpful Post. This will help me for sure. Keep it up! Looking for more posts.

Anonymous said...

awesome easy and useful information useful for me keep it up

rathincr said...

it's helpful hope good posts more...............thnx

Anonymous said...

Can you please tell us more about SCSI and SAS,usually we dont see it much frequently as its been used by high performance servers .

Anonymous said...

which is the latest model?

which is the best model for desktop users?

varsha said...

great work dude.....thank you :)

Anonymous said...

NiCe WoRk BuDdY. :D

Anonymous said...

if I am buying a lap top, which is the latest technology out of these ????

nisha said...

thanks for this information

Elliott Broidy said...

Wonderful resource!

Anonymous said...

Good Infomation.

Anonymous said...

thank you,this is what i'm searching for,very helpful :)

jestin bosco said...
This comment has been removed by the author.
jestin bosco said...

SSD contain no moving components. spinning magnetic discs are replaced by semiconductors. faster

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