3. Magnetic storage
This uses minute magnetic particles or 'domains' to store data.
A hard disk is an example of a magnetic storage device. It contains several platters on a spindle, spinning at high speed, with read/write heads floating just above the surface.
Another example of magnetic storage is a magnetic tape cartridge.
|Advantages of magnetic storage||Disadvantages of magnetic storage|
|Huge capacity, offers up to several terabytes per device.||Not as portable as other technologies. But external hard disks are commonly available, but they need to be treated carefully.|
|Low cost per gigabyte - magnetic tape is the cheapest, but hard disk is very low as well.||Hard disk has mechanical moving parts, so less rugged than solid state storage.|
|Hard Disk offers high speed data access||Data can be lost near strong magnetic fields, such as being too near a Hi-Fi speaker.|
|Hard Disk offers random access to data||Magnetic tape uses serial data access and so is very slow.|
|Magnetic tape can hold its data for up to thirty years in the correct environment.||Data read / write is not as fast as flash technology|
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Magnetic storage examples