Flashcards
Computing Paper 2: 1.1.3
Flashcards do conjunto (10)
- 1What is the difference between input and output devices?Device used to put data and information into a computer.
E.g. Keyboard, microphone, webcam
Device used to send information from computer.
E.g. Speakers, Printers, Projector - 2Storage: OpticalRead from & written to using lasers.
Binary represented by pits/lands.
Pits: scatter light, represent 0.
Lands: Reflect light, represent 1.
E.g. CDs, DVDs, Blu-ray - 3Storage: Advantages vs Disadvantages Optical-Long media life.
-Low cost per bit of storage.
-Portable.
-Easily damaged/scratched.
-Limited storage capacity.
-Slow transfer speeds. - 4Storage: MagneticRepresent binary using 2 magnetic states:
Polarised: magnetic poles align, can be read by read/write head passing over.
Unpolarised: magnetic poles randomly scattered & produce diff reading on read/write head.
E.g. Hard disk drives - 5Storage: Advantages vs Disadvantages Magnetic-Often fast access times.
-Can store large amounts of data.
-Relatively cheap.
-Data can be lost near high magnetic fields.
-Some use serial data access so slow. - 6Storage: Flash/ Solid-state diskUses logic gates NAND & NOR to store electrical charge in one of two states:
high (True) or low (False), used to represent info, stored in blocks, combined to form pages. - 7Storage: Advantages vs Disadvantages Flash/ Solid-state disk-Light and portable.
-SSD use less moving parts than flash.
-Costly but decreasing as use rises.
-Data extraction difficult process. - 8RAM (Random Access Memory)Fast main memory used to store data/ programs computer is currently using. Better computer execution as it has high access speeds.
More expensive per gigabyte than secondary storage, so often only 4/8 GB.
Volatile, loses info when power lost. - 9ROM (Read Only Memory)Can't be modified. Once programmed,
state of memory cells inside does not changed.
Useful for storing fixed sequences of instructions like a comp's startup routine. Non-volatile, retains data when powered off. - 10What is virtual storage?Storing information remotely so it can be accessed by any computer with access to same system. e.g. Cloud storage. Abstraction of multiple drives acting like one.
Popular as internet speeds increase. Can cost a lot & can limit user's network speed.
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- A level Computing (Computing Paper 2) FlashCards sobre Computing Paper 2: 1.1.3, criado por Qashrina Collier em 09-05-2021.
- Criado por
- Qashrina Collier
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