Page 18 - Computer - 4

Some common types of RAM are SRAM, DRAM, SDRAM, DDR RAM, and GDDR RAM.

Knowledge Discovery Subject Enrichment

Cache memory is a fast and efficient memory on which read
and write operations can be done faster than in RAM. Cache

memory usually stores the data and instructions used more
frequently by the CPU. It acts as a buffer between the CPU
and the RAM.

Try This Computational Skills

Fill in the blanks with the correct answer to relate the sizes of computer memory.

• 1 Byte = ________ bits • 1 PB = ________ TB
• 1024 GB = ________ TB • 1 YB = 1024 ________

Secondary Memory

RAM can only hold a limited amount of data. Furthermore, because of its volatile
nature, RAM cannot be used to store important data for extended periods of time.
As a result, you’ll need a device to store data permanently, from which it can be

accessed when needed. Such devices are called Secondary memory or Storage
devices. Secondary Memory is also known as Auxiliary Memory or External Memory.
It enables a user to permanently store large amounts of data.

Secondary memory is non-volatile and is not directly accessible by the CPU. The capacity
of secondary memory is large, and is usually measured in gigabytes or terabytes.

Knowledge Discovery Subject Enrichment

The size of a primary memory is usually smaller than a secondary memory, but its speed
is much faster than that of a secondary memory.

SECONDARY STORAGE DEVICES
Secondary storage devices are used to store information that is accessed frequently
by the CPU. These devices store data using magnetic, optical, or flash technology. Let

us learn about common secondary storage devices.

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