Secondary ____ is used to retain a copy of programs and data that need to be kept long term. A storage ____ is the physical hardware that transfers the data onto the storage ____. For example, a DVD writer (storage device) will burn a copy of the data onto a ____ disk (storage media). There are three technologies used for secondary storage, magnetic, OPTICAL and solid state. Hard disks and magnetic tape cartridges are examples of MAGNETIC storage. They can store large amounts of data, up to 185 TB in the case of magnetic tapes. Overall the cost of storage per gigabyte is the cheapest of the three types of media. They are robust and ____ but do need to be kept away from strong magnetic fields which can damage the data. Optical storage includes ____, ____ and ____ ____ ____ A laser beam is used to burn tiny pits onto the surface of the disk in order to store the data. Optical storage media is readily available, ____ and inexpensive if less than ____ of data needs to be stored. However, it is not suitable for storing terabytes of data, it is slower to write data to than a hard disk or flash memory and it can be damaged by scratches. ____ STICKS Flash memory or ____ ____ ____ includes ____ ____ solid state drives and ____ memory cards. ____ charges are used to store the data. Flash memory has a large storage capacity and can easily hold the data stored on a standard personal computer. Because there are no moving parts, unlike a ____ disk, it is reliable, fast to access and silent. However over the long term flash memory is less durable than ____ storage because it has a limited number of erase/ write cycles before it wears out. When deciding on the most suitable storage media to use for a particular situation, there are six key factors which must be taken into consideration. These are: ____ speed, portability, durability, reliability and cost.

Secondary Storage

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