Seconday Storage is kept outside of the computer
optical disk
These are flat dicks which store data as a series of bump.
CD-ROM
these are mainly used for the distrubution of software. Data is read only There is a large storage capacitydata is stored as an optical pattern
CD-R
CD-R (CD-Recordable) this means data can be stored on this disk only once
CD-RW
DVD
DVD-ROM
DVD-RW
magnetic tape
USB Stick
USB drives are printed circuit boards enclosed in a plactic case. They are small and light, but can easily get lost. these can be used with any computer and can have large storage capacities. USB sticks however, dont have a high transfer rate.
Amount of data that needs to be stored
How much can the storage device hold? It can be in Kilobyte(KB), Megabyte (MB), Gigabyte (GB) Terabyte (TB).
Does the device need to be portable?
some storage needs to be removable. This is also imporant that you choose the right device. If a student wanted to pring data to school they would most likely use a USB Stick, because its small and light.
Media type
Access time
this is the time that the storage device takes top access the data. This needs to be a resonable time.
Transfer Rate
Once the data is located it needs to be read and transfered to the computer.
Prinary storage is chips within the computer.
ROM
ROM (Read Only Memory)
Chip
read only
RAM
RAM (Random Access Memory)it is also called volatile memory because the contents goes when the power is switched off.
chip
read and write
Read and write means that it can be altered by the user.
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