A Presentation on Hard Disks By: Team 4 (HIS44): (1)Samarjyoti Das (972151) (2)Subhadeep Ghosh...
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Transcript of A Presentation on Hard Disks By: Team 4 (HIS44): (1)Samarjyoti Das (972151) (2)Subhadeep Ghosh...
![Page 1: A Presentation on Hard Disks By: Team 4 (HIS44): (1)Samarjyoti Das (972151) (2)Subhadeep Ghosh (986570) (3)Dipanjan Das (986510) (4)Sudhamayee Pradhan.](https://reader036.fdocuments.net/reader036/viewer/2022062504/5a4d1b8a7f8b9ab0599be9e3/html5/thumbnails/1.jpg)
A Presentation on Hard Disks
By: Team 4 (HIS44):(1)Samarjyoti Das (972151)(2)Subhadeep Ghosh (986570)(3)Dipanjan Das (986510)(4)Sudhamayee Pradhan (976267)(5)Ankita Mishra (976310)
![Page 2: A Presentation on Hard Disks By: Team 4 (HIS44): (1)Samarjyoti Das (972151) (2)Subhadeep Ghosh (986570) (3)Dipanjan Das (986510) (4)Sudhamayee Pradhan.](https://reader036.fdocuments.net/reader036/viewer/2022062504/5a4d1b8a7f8b9ab0599be9e3/html5/thumbnails/2.jpg)
Contents•WHAT HARD DISK IS?•COMPONENTS OF HDD•WHY HARD DISK IS USED?•DETAILS ABOUT FUNCTIONALITIES•HARD DISK MECHANISM•PERFORMANCE CHARACTERISTICS•THINGS TO BE TAKEN CARE OF•DEPENDENCIES•LATEST MARKET UPDATES•COMPARISON BETWEEN SSD AND HDD•ADVANCE TECHNOLOGY UPDATES
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What Hard Disk is ?
•Secondary storage device
•Also called Disk drives or hard drives or HDD
•Hard describes anything that is permanent or physically exists
•It is a non volatile form of storage
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Components
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Why Hard Disk is used?•Used to store and provide relatively quick and random access to large amounts of data (in Gbs or Tbs)•Data is stored permanently•If a computer's CPU is the brain of the PC, the HDD is its long-term memory-which preserves data, programs and the OS even while the machine is off.•HDDs are very robust and can be used for many years without problems
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Details about the Functionalities• Hard drives use magnetism to store information.• Platters are discs, one on top of the other spaced a few
millimetres apart where actual data is stored in 0's and 1's• Spindles rotates the platters.• Actuator is a motor responsible for moving or controlling
the hard drive head arm • Arms consist of copper heads mounted on its end• Copper heads are used to magnetize and demagnetize
using electricity to write or erase data• Platters : separated into different sectors and tracks• Tracks : rings on a disk where data can be written• Sectors: Subdivision of track on a magnetic disk.
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Hard Disk Mechanism
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Performance characteristics•Access Time: time taken before the drive actually transfers data. •Seek time: Time to find the correct track •Data transfer rate: Rate at which data can be retrieved from or stored to the disk.•RPM: Rotation of disk platters per minute . Eg 7200 rpm & 5400 rpm HDDs are available•Power Consumption Capacity
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Things to be taken care of
•Prevent from physical damage•Avoid magnetizing the hard drive•Prevent from Excessive heating•Avoiding frequent on and off : the act of frequently spinning up and spinning down can cause additional attrition on top of the wear and tear of regular use•Use of surge protector from power surges
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Dependencies•OS : During booting, the boot drive loads the system files from hard disk to RAM and executes them
•Processor : Speed of processor depends on hard disk.•Memory: If the RAM gets filled up then OS will start storing back and forth temporary data onto the hard drive.
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Latest Market Updates
SSD:
•Stands for Solid State Drive
•Uses NAND based Flash memory
•No mechanical moving components
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Comparison between HDD and SSD
•Durability: SSDs are more durable•Speed : Around 100 times faster than HDD•Power: Consumes less power .Around 3 times lesser than HDDs•Form factor: Lighter and smaller. 77 gms for SSD •Cost: Costlier than HDD •Noise and heat dissipation :Less noisier than HDDs and less heat dissipation .
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Projection based on public information about HDD market
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Advanced Technology Updates
•Hard drive companies are migrating away from the legacy sector size of 512 bytes to a larger, more efficient sector size of 4096 bytes, generally referred to as 4K sectors and enable the integration of stronger error correction algorithms to maintain data integrity at higher storage densities.
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•New hard drive tech will help Seagate crack 5TB barrier in 2014, 20TB in 2020.Seagate has developed a new technology called 'Shingled Magnetic Recording' (SMR) Seagate recently made public its intention to develop and supply 20TB hard disk drives, under its SMR technology•SSHD: Capacity, performance and value•SSD + HDD=SSHD
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