To Difference between ram and rom.

1. DIFFERENCE BETWEEN RAM AND ROM
Read-only memory or ROM is a form of data storage in computers and other electronic devices that can not be easily
altered or reprogrammed. RAM is referred to as volatile memory and is lost when thepower is turned off whereas ROM in
non-volatile and the contents are retained even after the power is switched off.
Random Access Memory or RAM is a form of data storage that can be accessed randomly at any time, in any order and
from any physicallocation in contrast to other storage devices, such as hard drives, where the physicallocation of thedata
determines thetime taken to retrieve it. RAM is measured in megabytes and thespeed is measured in nanoseconds and RAM
chips can read data faster than ROM.
Comparison chart
RAM ROM
Definition
Random Access Memory or RAM is a form of
data storage that can be accessed randomly at
any time, in any order and from any physical
location., allowing quick access and
manipulation.
Read-only memory or ROM is also a form of data storage that
cannot be easily altered or reprogrammed.Stores instuctions
that are not nescesary for re-booting up to make the computer
operatewhen it is switched off.They are hardwired.
Stands for Random Access Memory Read-only memory
Use
RAM allows thecomputer to read data quickly
to run applications. It allows reading and
writing.
ROM stores theprogram required to initially boot the
computer. It only allows reading.
Volatility
RAM is volatile i.e. its contents are lost when
the device is powered off.
It is non-volatile i.e. its contents are retained even when the
device is powered off.
Types
The two main types of RAM arestaticRAM
and dynamic RAM.
The types of ROM include PROM, EPROM and EEPROM.
Differences in use
RAM allows the computer to read data quickly and efficiently to be able to run applications efficiently, whereas ROM
stores the program required to initially boot the computer and performdiagnostics. RAM is a common typeof memory
found in computers and printers, and can go up to a few gigabytes. ROM is usually only a few thousand bytes of storage in
personal computers. RAM is primary memory and volatile
Different Types of RAM and ROM
The main types of RAM include staticRAM (SRAM), dynamic RAM (DRAM). StaticRAM is more expensive and has
more capacity for storage than dynamic RAM that has to be refreshed more often, and is thus slower.
ROMs are integrated circuits that contain data and most often cannot be altered. There are some types that can be somewhat
modified that include programmable ROM (PROM), erasableprogrammable ROM (EPROM), electrically erasable
programmable ROM (EEPROM) and Flash, which is a typeof EEPROM. PROM is a typeof ROM that can be programmed
only once by a special device and uses high voltages. EPROM can be rewritten using UV radiation, whereas EEPROM can
be rewritten electrically and such devices do not require to be removed from thecomputer. Flash drives are modern version
of EEPROM and fastest to erase and rewrite. Some other common types of ROM areCD-ROM, CD-R and CD-RW which is
used to store media and music files.