Storage Devices

Storage devices are divided into two types 1) Primary Memory 2) Secondary Memory

1. Primary memory (main memory): These types of memories are volatile memory. i.e. if the computer turn of the all the data & information written on RAM will be erased automatically.
   • RAM (Random Access Memory/Read-Write Memory) : It is a volatile memory after switch off the computer, every thing erase written in it.
     
     1. Static RAM (SRAM) : Data store in it never change until we change it or power off the computer.
     2. Dynamic RAM (DRAM) : Data store in it change or refresh after a specific time.
   • ROM (Read-only-memory)
     1. PROM : PROGRAMABLE ROM
     2. EPROM : ERASABHLE PROGRAMABLE ROM
     3. EEPROM : ELECTRICALLY ERASABHLE PROGRAMABLE ROM

2. Secondary memory (storage devices) : : These types of memories are non-volatile memory. i.e. if the computer turn of the all the data & information written on RAM will remain unchanged.
   1. Megnetic Disk
      • Hard Disk (Local Disk)
      • Floppy Disks
      • Memory Cards
      • Zip Drive
      • Pen Drive
      • External Hard Disk
   2. Optical Disk
      • CD-R
      • CD-RW
      • DVD-R
      • DVD-RW
      • Blue Ray Disc
      • CD-RW