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Ch.13 Secondary Storage Devices - Coggle Diagram
Ch.13 Secondary Storage Devices
13.1 main memory
RAM
Volatile
ROM
nom-volatile
in a comport firmware ---> a collection of instructions required to start a copmuter
basic input / output system (BIOS)
13.2 Secondary Storage
Magnetic storage
used for backing up
Solid-state storage
Optical storage
eg. DVD / CD
2 types of access
Sequential access
data is written sequentially
storage devices
Magnetic tape
use for back up storage but not daily used data
Direct access
hard disk
read / write heads and circular metal disks
data can be written in any storage position
Platters
one or more circular disks
fast, durable, high-capacity
Flash memory ---> read and written electronically at a fast speed
memory card ---> consists of flash memory & design to be small in physical size
13.3 Memory Hierarchy
Register ---> Cache memory in a processor ---> RAM ---> SSD ---> hard disk ---> magnetic tape