Magnetic storage
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What are the characteristics of hard disk drives?
• Each bit of data is represented by a -ve or +ve charged magnetic particle. Stored on a disk called platter. • Data could be stored anywhere on the disk, and so to read/write data we first need to find the location on the disk. A magnetic read/write head is used to access the data while the platter spins. • Not robust, can be damaged by shocks. • High capacity • Tends to last a very long time • Low cost • Slow to access because of the moving parts
What are examples of magnetic storage?
• Hybrid drives use both SSD and HDD, this way they have both characteristics of both memories. • Magnetic tape (now used for backups and some video cameras). • HDD are used as the main secondary storage device in a computer.