STORAGE

STORAGE

1. FUNTION

   • * Technology consisting of computer components and recording media used to retain digital data. It is a core function and fundamental component of computers.

2. TYPE OF STORAGE

   • 1) PRIMARY STORAGE
     • * known as main storage or memory, data stored for quick access by the computer's processor
       • TYPE OF PRIMARY STORAGE
         • 1) Random Access Memory (RAM) – Volatile primary storage
         • 2) Read Only Memory (ROM) – Non-volatile primary storage
           • Types of Read Only Memory (ROM)
             • 1) Programmable Read Only Memory (PROM)
               • 2) Erasable Programmable Read Only Memory (EPROM)
                 • 3) Electrically Erasable Programmable Read Only Memory (EEPROM)
   • 2) SECONDARY STORAGE
     • called auxiliary storage or external storage, is non-volatile storage that is not under the direct control of a computer's central processing unit (CPU) or does not directly interact with an application
       • TYPE OF SECONDARY STORAGE
         • SEQUENTIAL ACCESS DEVICE
           • 1) MAGNETIC TAPE
         • DIRECT ACSESS DEVICE
           • 1) MAGNETIC DISK
             • 1.1) FLOPPY DISK
             • 1.2) HARD DISK
               • 1.2.1) ZIP DISK
               • 1.2.2) DISK PACK
           • 2) 0PTICAL DISK
             • CD-ROM
             • CD-RW
             • DVD
             • CD-R
           • 3) MEMORY SRORAGE DEVICE
             • FLASH DRIVE
             • MEMORY CARD

3. Characteristics of storage

   • 1) Volatility
   • 2) Mutability
     • Read/write storage or mutable storage
     • Slow write, fast read storage
     • Read only storage
   • 3) Accessibility
     • Sequential access
     • Random access
   • 5) Capacity
     • Raw capacity
     • Memory storage density
   • 4) Addressability
     • Location-addressable
     • File addressable
     • Content-addressable
   • 6 Performance
     • Reliability
     • Granularity
     • Throughput
     • Latency
   • 7) Energy use

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