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Secondary Storage Devices (Terry Tam) - Coggle Diagram
Secondary Storage Devices (Terry Tam)
main memory
random access memory (RAM)
volatile
The storage size and the data access rate of RAM greatly affect the performance of a CPU.
read-only memory (ROM)
non-volatile
store firmware
basic input/output system (BIOS)
secondary storage
sequential access
magnetic storage (magnetic tape)
use for backup storage
speed affected by:
access time
data transfer rate
direct access
hard disk
platters
performance depends on:
seek time
drive rotational speed
fast, durable and high-capacity
solid-state drive (SSD)
flash memory
fast speed
durable, portable
solid-state storage
memory card
USB flash drive
optical storage (CD)
optical disks
reflective
direct access (2)
redundant array of independent disks (RAID)
improving data transfer rate, error detection and reduces the chance of data loss due to device failure
Network-attached storage (NAS)
local area network (LAN)
cloud storage
provided by Internet service providers (ISP)
memory hierachy
register
cache memory in a processor
RAM (main memory)
SSD (secondary storage)
hard disk (secondary storage)
magnetic tape (secondary storage)
⬅️ lowest data access rate, largest storage size and lowest unit price per capacity (vice versa)