1.2 memory
- Created by: christopher Glanville
- Created on: 13-01-22 14:19
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- 1.2. Memory
- Primary storage
- RAM
- Volatile
- Random access memory
- Stores instructions and data for programs currently running
- ROM
- Non-Volatile
- Read only memory
- Stores the BIOS
- RAM
- Secondary storage
- Non volatile
- Permanent
- Magnetic
- Magnetizes small parts of a spinning metal disc.
- Magnetized-1 Demagnetized-0
- Cheap, high-capacity, durable.
- Magnetizes small parts of a spinning metal disc.
- Optical
- Optical devices use a laser tracking over pits and lands
- Pits-1 Lands-2
- Optical devices use a laser tracking over pits and lands
- Solid state
- Uses transistor on/off.
- on-1 off-0
- Tends to have lower capacity as it is high in cost
- Reasonably fast compared to magnetic and optical.
- Uses transistor on/off.
- Units
- Bit
- Nibble
- Byte
- Kilobyte
- Megabyte
- Gigabyte
- terabyte
- Petabyte
- Compression
- Lossy
- Original file cannot be recovered completely.
- lower quality
- Good for images and media files.
- Original file cannot be recovered completely.
- Lossless
- Original file can be recovered completely.
- Good for text files.
- Lossy
- Primary storage
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