secondary storage and virtual memory Flashcards
the three secondary storages
Optical. Solid state. Magnetic
2 examples of SS devices
Flash memory card. memory stick
2 examples of optical storages
DVD-R. blu-ray
2 examples of magnetic storages
tape. hard disk drive
virtual memory
why is it needed?
where are they held?
when there is not enough physical RAM to store open programs.
they’re held on hard disks.
magentic, optical and solid state
POSTIVES
MAG has 2. OPT has 3. SS has 2.
magentic: cheap. large capacity
optical: cheap. light weight. portable
solid state: durable. fast access time
magnetic, optical and solid state
NEGATIVES
they all have two
magentic: slow access times. fragile
optical: slow access times. prone to scratches
solid state: cost. limited read/write
virtual memory
when programs are not being currently executed where do they go and from where
they are transferred to virtual memory from the RAM
virtual memory
when programs are being used where do they go and from where
they go to the RAM from virtual memory
what do you base storage devices on
creating stories, pursuing dreams, radiating confidence
c capacity
s speed
p portability
d durability
r reliability
c cost
why is secondary storage necessary
4 reasons
- storage of data and programs when power is off
- semi-permanent storage of data that can change
- backup of data files
- archive of data files
instead of using DVD-R (an optical storage) what is now used
cloud storage and downloading
when would virtual memory be used
when there is not enough physical RAM to store open programs
where is virtual memory stored what kind of secondary storage is it
on a hard disk drive, which is a type of magnetic storage
what are 2 advantages of virtual memory
means user does not have to buy more RAM.
allows user to run more applications and do more mult- tasking
