What is HDD?
HDD stands for Hard Disk Drive.HDD is an electro-mechanical storage
device that uses magnetic storage for storing and retrieving the digital data
permanentaly. It is a non-volatile storage device. Hard Disk Drive is installed
internally in our computer systems, which is connected directly to the disk
controllers of the motherboard.
Hard Disk Drive is a storage device which stores
the operating system (OS), installed software, and the other computer files. A
hard drive is basically the computer’s storage. It’s responsible for processing
and storing data.HDD means the data is retained when our computer system is shut
down. HDD is also called a fixed disk, hard disk, or hard drive.
The HDD was
introduced in 1956 by IBM. It basically consists of hard drive platters (disk
shaped magnetic material) inside air sealed casing.From the inside, one side of
the casing is the electronics control board called disk controller. There is
also a motor which spins the platters at 3600 or 7200 rpm beneath the board.
Advantages of Hard Disk Drive :
- HDD is cheaper than SSD.
- HDD is easily available in the market.
- The capacity of HDDs are large for storing the data.
Disadvantages of Hard Disk Drive :
- HDDs consume more power.
- The weight of HDD is heavy than SSD.
- The speed of HDD is slow as compare to SSD.
- HDD create more noise as compare to SSD.
FOUR MAJOR COMPONENTS OF A HARD DISK DRIVE :
- Platter - The platters which are disks that store data in an organized fashion.
- Spindle - The spindle, responsible for keeping the platters in position and rotating them when needed.
- Read/Write Arm - The read/write arm which guides the read/write head to the appropriate position based on data that needs to be written/read.
- Actuator - The actuator that takes instruction from the circuit board to control the movement of the read/write arm as well as supervise the transfer of data from the platters.
TYPES OF HARD DRIVES :
1. SCSI :
SCSI Stands for Small Computer System Interface . SCSI
or Small Computer System Interface allows for the connection of different
peripheral devices such as hard drives, printers, scanners, CD-Drives and more.
SCSI drives can also be connected internally and externally.
2. PATA :
PATA
Stands for Parallel Advanced Technology Attachment. PATA is a standard for
connecting hard drives into computer systems. As its name suggest, PATA is based
on parallel signaling technology, unlike serial ATA (SATA) devices that use
serial signaling technology. Integrated Drive Electronics ( IDE ) drives operate
according to this standard.
3. SATA :
SATA Stands for Serial Advanced Technology
Attachment. SATA drives have replaced PATA due to the better performance. They
transfer data faster (150 up to 600 megabytes per second) as compare to PATA (
133 megabytes per second), use less power (250mV opposed to 5V) and SATA cables
are thinner and more flexible.
Difference Between HDD and SSD :
HDD :
- HDD stands for Hard Disk Drive.
- HDD is cheaper than SSD.
- HDD is easily available in the market.
- The capacity of HDDs are large for storing the data.
- HDDs consume more power.
- The weight of HDD is heavy than SSD.
- The speed of HDD is slow as compare to SSD.
- HDD create more noise due to the mechanical movements.
- HDD generate more heat because of the mechanical part.
- The average boot-up time of OS is 30 to 40 seconds.
- The file opening speed of HDD is slightly slower.
SSD :
- SSD stands for solid state Drive.
- SSD is costly than HDD.
- SSD is not easily available in the market.
- The capacity of SSDs are short for storing the data.
- SSDs consume less power.
- The weight of SSD is light-weight than HDD.
- The speed of SSD is fast as compare to HDD.
- SSD does not create noise.
- SDDs generates little heat because there is no moving part.
- The average boot-up time of OS is 10 to 13 seconds.
- The file opening speed of SSD is 30% faster than the HDD.
What is SSD?
SSD stands
for Solid State Drive. It is a non-volatile storage device that stores the data
on flash memory chips and maintains the data in a permanent state, even when the
power is off..
Sometimes, this storage device is also called as a solid-state
disk or solid-state device. SSDs have lower latency and access quickly as
compare to HDD. It stores the data in the semiconductor cells. SSDs have no
moving parts. Therefore they are called solid-state drives.
Advantages of Hard Disk Drive
- SSD consume less power.
- The weight of SSD is light-weight than SSD.
- The speed of HDD is fast as compare to SSD.
- SSD does not create noise.
Disadvantages of Hard Disk Drive
- SSD is costly than SSD.
- SSD is not easily available in the market.
- The capacity of HDDs are low for storing the data.
IDE :
IDE Stands for
Integrated Drive Electronics. IDE is also known as ATA or PATA. It is a standard
interface for IBM computers that was first developed by Western Digital and
Compaq in 1986 for compatible hard drives and CD or DVD drives.
IDE is different
than SCSI and ESDI because its controllers are on each drive, meaning the drive
can connect directly to the motherboard or controller. IDE and its updated
successor, EIDE (Enhanced IDE), are common drive interfaces found in IBM
compatible computers.
EIDE :
EIDE Stands for Enhanced Integrated Drive
Electronics. EIDE is an improvement version of the IDE .
It was developed by
Western Digital corporation which is used in IBM compatible computers. EIDE
supports data rates from 4 and 16.6 MBps.
SCSI :
SCSI Stands for Small Computer System Interface . SCSI or Small
Computer System Interface allows for the connection of different peripheral
devices such as hard drives, printers, scanners, CD-Drives and more. SCSI drives
can also be connected internally and externally.