SLR3-1.1: The uses of magnetic, flash and optical storage devices
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What are the two common types of storage?
1) Drive 2) Media
What is meant by drive storage?
The device that reads and writes data from secondary storage
What is meant by media storage?
It’s what the data is actually stored on
Magnetic + Drive =
Magnetic hard drive
Solid state + Drive =
Solid-state drive
Optical + Drive =
Optical drive
What are the 3 main types of storage devices?
1) Magnetic 2) Solid- state 3) Optical
What are 3 advantages of magnetic storage?
1) Cheap 2) Large capacity 3) Suitable for long term storage and for back-ups
What are some examples of magnetic storage?
• Hard Disk Drive (HDD) • Magnetic Tape Drives
How does magnetic storage store data?
It stores data by magnetising particles on a disk or tape
What are 2 disadvantages of magnetic storage?
1) Slow 2) Fragile 3) Has moving parts
What are 2 advantages of solid-state/flash storage?
1) Durable 2) Fast access
What are some examples of solid-state/flash storage?
• Solid-state drives (SSD) • USB flash drives
How does solid-state/flash storage store data?
It stores data is flash memory cells
What are 2 disadvantages of solid-state/flash storage?
1) Expensive 2) Limited read/writes
What are 3 advantages of optical storage ?
1) Cheap 2) Portable 3) Robust
What are some examples of optical storage?
• CDs *DVDS • Blue -ray disc
How does optical storage store data?
It stores data by using a laser to burn pits into the surface of the disc
What are 3 disadvantages of optical storage?
1) Not scratch-resistant 2) Low capacity 3) Very slow to write to