Computer Science - OCR GCSE - 1.2.2 Secondary Storage

What is meant by secondary storage?

A non-volatile storage that generally holds much more data than main memory as permanent storage and is relatively inexpensive per MB. It is outside the CPU and is under its control.

Explain why is Secondary Storage necessary:

• To store data - Long term/Permanent

• Larger capacity

• Some forms of secondary storage are portable

How many bits in a Byte?

8

How many bytes in a Kilobyte?

1000 (1024)

How many bytes in a Megabyte?

1,000,000

How many Megabytes in a Gigabytes:

1000

How many Megabytes in a Gigabyte?

1,000,000

State the names of three types of storage devices:

Solid State Drives

Optical Devices

Magnetic Devices

Describe what is meant by a magnetic storage device:

A storage device which uses magnetic states (north/south polarization)  to store data in binary form