1.2 memory + storage

Question 1

items stored in RAM

Answer 1

Random Access Memory= programs/data/operating system that’s currently in use

Question 2

compare RAM + ROM

Answer 2

RAM= volatile, loses memory when switched off, read-write
ROM= non-volatile, memory not lost when computer switched of, read-only

Question 3

what is virtual memory

Answer 3

simulated memory written on hard drive to a file- appears to act as RAM but is secondary

Question 4

why do we need virtual memory

Answer 4

if computer runs more programs than RAM can support, VM allows more memory to be used than in system

Question 5

how is VM implemented

Answer 5

OS set up virtual memory using VMM. VMM creates a file oh hard disk (enough for memory needed), OS can address memory as if it were RAM, paging

Question 6

what is paging (extra information)

Answer 6

(also called swapping) process used by OS to move data between RAM and VM. moving data when processes are not needed but copied back to RAM when needed

Question 7

what is flash memory

Answer 7

solid state media (no moving parts, removable storage, device using flash memory)

Question 8

devices that use flash memory

Answer 8

USB drives, memory cards, SSD cards

Question 9

What are the advantages associated with using flash memory?

Answer 9

+durable will not break if dropped/ exposed to heat.
+Very reliable as no moving parts.
+V compact but can store lot of data in a small space.
+V fast access time compared to a hard disk/ DVD.
+Low cost and reliable.
+Light weight so easily portable.

Question 10

What are the problems associated with using flash memory?

Answer 10

Can get lost easily.
Can wear out over a long time period.
More expensive than CD or DVD.
The metal part that is inserted into the USB port can become bent or damaged

Question 11

what is secondary storage

Answer 11

devices are not directly accessible with CPU, not constantly connected with computer,

Question 12

why is secondary needed

Answer 12

back up data in main memory, stores data/instructions that would be otherwise lost when switched off, for larger storage capacity

Question 13

examples of external secondary storage devices (not built in)

Answer 13

CD, memory card, DVD, Blu-ray disk, USB memory stick, (external) solid state disk/hard disk drive

Question 14

examples of internal secondary storage

Answer 14

Hard Disk Drive (HDD), SSD (solid-state drive)

Question 15

what is optical storage’s advantages

Answer 15

(an example of 3 main types of secondary storage)
\+inexpensive
\+reliable
\+robust
\+ relative large capacity

Question 16

one other type of secondary storage

Answer 16

-Magnetic
Store large capacity
commonly used making it possible to share compatibility
can be used to store operating system and other files and programs
reliable
cost-effective.
OR
-Solid state
Flexible
Inexpensive
faster access to data
Can be used for portable devices
generally smaller in size
robust
easy to use
no setup requirements.