Page 449 - General Knowledge

GENERAL KNOWLEDGE 2019

nonvolatile memory. The significant difference between a ROM and a PROM is that a ROM
comes with pre-written by the computer manufacturer whereas PROM manufactured as blank
memory. PROM can be programmed by PROM burner and by blowing internal fuses
permanently.

EPROM (Erasable Programmable Read Only Memory)
EPROM is pronounced ee-prom. This memory type retains its contents until it exposed to
intense ultraviolet light that clears its contents, making it possible to reprogram the memory.

EEPROM (Electrically Erasable Programmable Read Only Memory)

EEPROM can be burned (programmed) and erased by first electrical waves in a millisecond. A
single byte of a data or the entire contents of device can be erased. To write or erase this
memory type, you need a device called a PROM burner.

Secondary Memory

If we need to store large amount of data or programs permanently, we need a cheaper and
permanent memory. Such memory is called secondary memory. Here we will discuss
secondary memory devices that can be used to store large amount of data, audio, video and
multimedia files.

Characteristics of Secondary Memory

These are some characteristics of secondary memory, which distinguish it from primary
memory −

 It is non-volatile, i.e. it retains data when power is switched off
 It is large capacities to the tune of terabytes

 It is cheaper as compared to primary memory
Depending on whether secondary memory device is part of CPU or not, there are two types of
secondary memory – fixed and removable.

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