Physical Characteristics of Memory

1. Volatile ~ Non-Volatile 

• Volatile memory: A temporary memory that loses its contents when the computer or hardware device loses power, memory storage type is not permanent.  

SDRAM

    Example: RAM (EDO-RAM, SDRAM, DDRAM).

• Non-Volatile memory: A memory that keeps its contents even if the power is lost, storage in this type of memory is permanent.  

Flash Memory

    Example: EPROM, EEPROM, Flash Memory. 

  

 2. Erasable ~ Non-Erasable 

• Erasable memory: Can be remove or replaced by another content. Example: EPROM (Erasable Programmable = Read Only Memory) is removed with Ultra Violet rays, EEPROM (Electrically Erasable Programmable = Read Only Memory) is removed with an electric, FLASH Memory removed electroplate.
• Non-Erasable: Memory which can not be erased after the manufactured.

ROM

    Example: ROM (Read Only Memory), PROM (Programmable ROM).