1.3:Storage

1.3:Storage

1. Storage Sizes

   • GB
   • KB
   • Byte
   • MB
   • Nibble
   • Bit

2. DataBase

   • 4 Fields
     • First name(Text up to 10 Characters
     • Surname(Text up to 10 characters)
     • Date of Birth
     • Number of children
   • Data Types
     • Text
       • 1 Byte per character
     • Integer
       • 4/8 Bytes
     • Real
       • 4/8 Bytes
     • Boolean
       • 1 Byte
     • Date
       • 8 Bytes

3. Key words

   • Secondary Storage
     • Long term storage and data,software,files,OS
   • Optical
     • These are all Types of Storage
     • A laser light creates marks in a pattern on a disk
   • Magnetic
     • Read/Write move across the medium and change how magnetised that part of the medium is.
   • Solid State
     • This is made of microchips(switches)
   • Durability
     • How long will it last e.g. if its dropped
   • Reliability
     • How consistently does it perform?
   • Portability
     • How easy is it to move it from one place to another?
   • Capacity
     • How much data can it store?
   • Speed
     • How fast can it access data?
   • Cost
     • How much does it cost per KB, MB or GB

4. Secondary Storage

   • This is a device that is not constantly connected to the computer
   • Auxiliary is another name for secondary storage
   • An internal secondary storage device is Hard disk drive