Types of Hard Disk

1. Types of Hard Drive
Dr. Kamal Gulati

2. Four types of Hard Drives
• Parallel Advanced Technology Attachment (PATA)
• Serial ATA (SATA)
• Small Computer System Interface (SCSI)
• Solid State Drives (SSD)

3. 1.) Parallel Advanced Technology Attachment
(PATA)
• These were the first types of hard disk drives and they made use of
the Parallel ATA interface standard to connect to computers.
• These types of drives are the ones we refer to as
• Integrated Drive Electronics (IDE) and
• Enhanced Integrated Drive Electronics (EIDE) drives.

4. A hard disk drive (PATA type)

5. 2.) Serial ATA - SATA
• SATA drives can transfer data faster than PATA types by using serial
signalling technology.
• SATA cables are thinner and more flexible than PATA cables.
• They have a 7-pin data connection, with cable limit of 1 meter.
• Disks do not share bandwidth because there is only one disk drive
allowed per SATA controller chip on the computer motherboard.
• They consume less power. They only require 250 mV as opposed to
5V for PATA.

6. A SATA Hard Disk Drive Pin Out

7. 3.) Small Computer System Interface
SCSI
• Devices that are connected in a SCSI have to be terminated at the
end. Here are some of their advantages.
• They are faster.
• They are very reliable.
• Good for 24/7 operations.
• Have a better scalability and flexibility in arrays.
• Well-adapted for storing and moving large amounts of data.

8. Small Computer System Interface

9. 4.) Solid State Drives
• They are latest in drive technology that we have in the computer
industry.
• Here are some of their advantages.
• Faster data access.
• Less susceptible to shock.
• Lower access times and latency.
• Durability.
• Less power usage.

10. A Solid State Drive (SSD)