по bethany baker 12 лет назад
452
Больше похоже на это
Prinary storage is chips within the computer.
RAM (Random Access Memory)
it is also called volatile memory because the contents goes when the power is switched off.
Read and write means that it can be altered by the user.
ROM (Read Only Memory)
Once the data is located it needs to be read and transfered to the computer.
this is the time that the storage device takes top access the data. This needs to be a resonable time.
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.
How much can the storage device hold? It can be in Kilobyte(KB), Megabyte (MB), Gigabyte (GB) Terabyte (TB).
Seconday Storage is kept outside of the computer
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.
These are flat dicks which store data as a series of bump.
CD-R (CD-Recordable)
this means data can be stored on this disk only once
these are mainly used for the distrubution of software.
Data is read only
There is a large storage capacity
data is stored as an optical pattern