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TOPIC 3.2: HARD DRIVE - Coggle Diagram
TOPIC 3.2: HARD DRIVE
Descriptions
- More platters mean more data storage capacity
- The platters rotate as a unit on a spindle, making thousands rotation per minute.
- Hard disk platters are typically 3.5" in diameter, with storage capacities ranging from 1 TB to 6 TB, the largest is 15 TB
- While the computer running, the platters in the hard disk rotate at a high rate of speed.
- This spinning usually 5400 to 15000 revolutions per minutes, allows nearly instant access to all tracks and sectors on the platters.
- The platters may continue to spin until power is removed from the computer or slow down after a specified to save power.
Hard disk technology is preferred type of main storage for most personal computers for 3 reasons:
- Provides lots of storage capacity
- Fast access to files
- Hard disk is economical (the cost of storing 1 GB of data is about 5 cents)
How does hard disk work?
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Step 3: When software requests a disk access, read/write heads determine current or new location of data.
Step 4: Head actuator positions read/write head arms over correct location on platters to read or write data.
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Descriptions (...cont)
- Hard disk are not durable as many other storage technologies.
- Data stored on magnetic media can be unintentionally altered by magnetic fields, dust, mold, smoke particles, heat and mechanical problems with a storage device.
- Overtime, magnetic media lose their magnetic charge, resulting in lose data.
- Hard disk lifespan is estimates about 3-5 years.
- To prevent contaminants from contacting the platters and causing head crashes, a hard disk is sealed in its case.
- Although hard disks have become considerably more rugged in recent years, you should handle and transport them with care.
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SATA vs IDE (PATA)
- Types of interfaces to connect storage devices (like hard drives) to a computer's system bus.
- SATA stands for Serial Advances Technology Attachment or Serial ATA and IDE is also called Parallel ATA or PATA.
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