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Storage Devices (Primary)
Transcript of Storage Devices (Primary)
Mohd. Ibrahim Pishol
Patricia Antai Robin
Nur Ezzati Edmund
What is storage devices?
RAM (Random - Access Memory)
can be read or retrieved and written or stored during processing
any type of hardware that stores data.
3 types of storage devices
known as main storage or memory,
; the main area in a computer in which data is stored for quick access by the computer's processor.
RAM (Random - Access Memory)
ROM (Read - Only Memory)
Two types of RAM
a) DRAM(Dynamic Random Access Memory)
b) SRAM(Static Random Access Memory)
- differ in the technology they use to hold data
A type of
; used in most
The term dynamic indicates
; the memory must be constantly refreshed
or it will lose its contents.
RAM (random-access memory)
is sometimes referred to as
DRAM (pronounced dee-ram)
to distinguish it from static RAM (SRAM).
more reliable than the more common
DRAM (dynamic RAM)
doesn't need to be refresh like
faster and less volatile than dynamic RAM
(requires more power & more expensive)
Is there a limit how much RAM can add to the computer?
designed with maximum limit on the amount of RAM it can support
designed with specific number of slots on the motherboard onto which memory cards fit
(Read Only Memory)
Pronounced rahm, acronym for read-only memory, computer memory on which data has been prerecorded
Once data has been written onto a ROM chip, it cannot be removed and can only be read.
ROM retains its contents even when the computer is turned off.
referred to as being nonvolatile, whereas RAM is volatile
used extensively in calculators & peripheral devices ; laser printers, whose fontsare often stored in ROMs
Types of ROM
PROM & EPROM
(programmable read-only memory)
a memory chip on which data can be written only once.
PROMs retain their contents when the computer is turned off.
PROM is manufactured as blank memory
(Erasable programmable read-only memory)
a special type of memory that retains its contents until it is exposed to ultraviolet light
ultraviolet light clears its contents, making it possible to reprogram the memory
To write to and erase an EPROM, you need a special device called a PROM programmer or PROM burner.
used widely in personal computers -they enable the manufacturer to change the contents of the PROM before the computer is actually shipped.