Define storage
keep data, information, program and applications
Cloud data
keep data on server on the Internet
differ Reading and Writing
reading: from storage to memory
writing: from memory to storage
Define capacity
number of byte storage can hold
First 5 storage terms
- Kilo - thousand - 210
- Mega - million - 220
- Giga - billion - 230
- Tera - trillion - 240
- Peta - quadrillion - 250
Define access time
- time taken to locate an item on the storage medium
- time taken to transfer an item from memory to processor
memory vs storage
memory is faster but expensive
Examples of storage
- SSD
- Hard disks
- memory card
- optical dics
What is hard disks
one or more inflexible, circular platters that use magnetic particles to store instructions, data, and information.
what vary the capacity of hard disks
- density
- number of platters
- longitudinal or perpendicular recording
- composition of magnetic coating
Formatting in hard disks
- divide hard disks into tracks and sectors
How: - track form circle on the hard disk
- the track is divided into sectors
- several sectors called cluster
characteristics of hard disk
- tracks
- sectors
- platters
- read/write head
- revolutions per minumte
How hard disk works
- circuit board control the small motor
- small motor spin the platter
- head/write head determine current or new location of data
- position the head/write head on correct location to read or write data
SSD (solid state disk)
flash memory storage device that contain its own processor
advantages of SSD
- faster access time
- faster transfer rate
- more durable
- less heat generated
- less power consumption
- quieter operations
- lighter weight
Volatility of storage
Non-volatile
- content remain when power is off
(most RAM are volatile)
