Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
Define input devices |
Allow data to be entered into the computer |
|
|
List some input devices |
Keyboard Mouse Graphics tablet Touch screen Scanners e.g. Barcode scanners |
|
|
Define output devices |
Allow information to be retrieved from the computer |
|
|
List some outout devices |
Monitor Speaker Touch screen |
|
|
How does magnetic storage work? |
An internal at hard drive for example stores data by having a magnetic platter. Data is read by an arm touching the platter while it spins. The faster the platter spins, the faster the data can be read from the disc |
|
|
Advantages and disadvantages of magnetic storage |
+ high capacity + inexpensive compared to flash storage - have moving parts so easily damaged - use more power than flash storage so to reduce power consumption devices like laptops use lower speed HDD's |
|
|
Define Flash memory |
Storage that uses a special type of non-volatile RAM to store data |
|
|
Advantages and disadvantages of flash memory |
+No moving parts so can be moved whilst data is being written/read +consume a low amount of power -most expensive storage medium |
|
|
Define optical storage |
Indentations are made into discs. Binary data is stored on the indentations. Lasers are aimed at the indentations to read the data |
|
|
Advantages and disadvantages of optical storage |
+capacity makes them suitable for high definition data such as CD's and DVD's +relatively low cost -can be snapped easily, easily broken -size of the data limits the amount of data that can be stored |
|
|
Define RAM and describe 2 characteristics |
RAM is the main memory within a computer, used to store data currently in use by the computer -is a volatile type of memory so when power is list the contents of RAM will also be lost -not as fast as cache memory |
|
|
Define ROM and list 2 characteristics |
A read only type of memory -used to store boot instructions for the computer -non-volatile so retains data when power is lost |
|
|
Define a NAS and give 2 examples of a NAS |
Network attached storage -RAID -SAN |
|
|
Define a RAID |
Redundant array of independent discs - allows multiple drives to be brought together as a single drive. Can improve performance and robustness |
|
|
How can raids be set up? Different rain types |
RAID 0 (striped) - Data from a file is split between drives. No fault tolerance as if one drive fails some data is lost and the file could corrupt RAID 1 (mirrored) - The same data is on multiple drives so if one drive breaks then data isn't lost. However, this increases read times RAID 3-4 (striped parity) - Provides fault tolerance and provides parity checks and error correction |
|
|
Define SAN's |
Storage area network - acts as a gateway to a series of block devices, such as RAID's and brings them together. Used in large networks by larger organisations |
