3
Storage hierarchy
A “storage hierarchy” uses a pyramid-shaped hierarchy diagram to represent the structure of storage devices used by a computer. Normally, storage
devices are stacked in order of data access speed; storage devices with
slower data access speed are at the bottom, while storage devices with
faster access speed are at the top. The farther up the pyramid, the closer in
proximity to the CPU.
High speed,
high cost
Cache
memory
Main
memory
Auxiliary memory
Low speed,
low cost
HDD (Hard Disk Drive)
8-1-3 Input/Output devices
A computer can be connected to peripherals such as printers and scanners.
In order to connect the peripherals, the type of “interface” used must
match.
1
Input/Output interfaces
An “input/output interface” is an intermediary device or system for exchanging data (electrical signals) between two points such as a computer
and peripheral.
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