Unit 1.2: Memory
- Created by: Chaza_McNaza
- Created on: 17-11-21 20:54
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- Topic 1.2: Memory
- Secondary Storage
- Optical
- E.g. CD, DVD, Blu-Ray
- Easy to Scratch
- Fairly easy to move around.
- Uses laser technology to identify gaps and lines
- Known as Lands & Pits - Represents 1 and 0.
- Reference Image Here:
- Known as Lands & Pits - Represents 1 and 0.
- Solid State
- SSD Drives
- More Robust
- Less Moving Parts
- Most commonly used in the world.
- Uses circuit boards and electdricity to trap in barriers
- These represent 1 and 0.
- Magnetic
- E.g. USB Stick
- Older-Style Hard Drives
- Has hard portability
- Less Robust
- Many moving parts.
- Can get damaged easily due to moving parts.
- Works with magnets with two reactions: Together, Not Together
- Examples of characteristics
- Size
- Capacity
- Physical
- Portability
- Durability
- Cost
- Speed
- Reliability
- Permanent (Never Lost)
- Size
- Optical
- Primary Memory
- RAM
- Stores programs and files in use.
- Stands for Random Access Memory
- Volatile - Deleted when there is no power.
- ROM
- Non-Volatile
- Doesn't get deleted when it loses power.
- Files in this section cannot be modified.
- Stands for Read Only Memory.
- Stores the BIOS and Bootup Sequence.
- BIOS: Basic Input Output System
- Non-Volatile
- Virtual Memory
- Uses Secondary Storage
- Used to Act as RAM
- It shouldn't be used as it will slow down a PC because this part is further away from the RAM/CPU.
- Slows access to instructions.
- Only used when the RAM is full.
- RAM
- Units
- Bit
- Nibble
- Byte
- B
- Kilobyte
- KB
- Megabyte
- MB
- Gigabyte
- GB
- Terabyte
- TB
- Petabyte
- PB
- Compression
- Part of the Utility Software
- Lossy
- Compresses the data, but some data is permanently lost.
- Uses in: JPEG or MP3 files.
- Compresses the data, but some data is permanently lost.
- Lossless
- Compresses the data, but rebuilds itself to the original copy when re-opened.
- Uses in: DOCX or ZIP files.
- Compresses the data, but rebuilds itself to the original copy when re-opened.
- Data Storage
- Untitled
- Secondary Storage
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