Input, Output, and Storage devices Flashcards
Input devices…
supply data to the CPU
Output devices…
return data from the CPU
Storage devices…
store data in binary form
Name the 3 optical devices
CD
DVD
Blue-Ray
Describe optical devices
They are read from and written to using laser beams. Binary information is represented by the portions of the device (pits) scatterring light or reflecting light (lands). A pit represents a 0, while a land represents a 1.
Describe CD, stating advantages, disadvantages, and usage.
a) stores small amounts of data
b) very portable, light, thin, small
c) slow transfer speeds, limited storage capacity, prone to scratch
Describe DVD, stating advantages, disadvantages, and usage.
a) stores small amounts of data
b) Higher storage capacity than CDs, very portable, light, thin, small
c) slow transfer speeds, limited storage capacity, prone to scratch
Describe Blue-Ray, stating advantages, disadvantages, and usage.
a) stores small amounts of data
b) Much higher storage capacity than DVDs, very portable, light, thin, small
c) slow transfer speeds, limited storage capacity, prone to scratch
Describe magnetic devices
They represents binary information by using two states: polarised and unpolarised. If an area is polarised then all magnetic poles are aligned, otherwise they are randomly scattered.
Describe HDD, stating advantages, disadvantages, and usage.
a) stores large amounts of data
b) High storage capacity
c) slow transfer speeds, prone to damage due to moving parts
Describe magnetic tape, stating advantages, disadvantages, and usage.
a) stores large amounts of data
b) adjustable storage by increasing tape size
c) bulky
Describe floppy disks, stating advantages, disadvantages, and usage.
a) stores small amounts of data
b) limited storage capacity
c) thin, small size, portable, light weight.
Describe flash memory, stating advantages, disadvantages, and usage.
a) stores small amounts of data using the NOR logic gate or large amounts of data using the NAND logic gate, both formed by silicoin semi-conductors that represents true or false as high or low state
b) fast, compact, non-volatile
c) costly
Describe SSDs, stating advantages, disadvantages, and usage.
a) stores small amounts of data
b) limited lifespan due to higher and higher voltage required when re-writing memory, costly
c) resistant to damage due to movement, small size, portable, light weight, high data transfer rates.
State the 2 primary storage
RAM and ROM
