Storage 2.0

Storage 2.0

1. Secondary Storage

   • There are three Types of Storage
     • Optical
       • When data is recorded by marking patterns on a disk with a laser light. Patterns can be translated and read again with said laser light. Non-Volatile e.g. DVDs , CDs
         • Encodes bits in the form of Pits (A 0 or off, due to lack of reflection when read) and Lands (A 1 or on, due to a reflection when read)
         • Can be Portable and Durable, quite Cheap, not Expensive
     • Magnetic
       • When data is stored by using different patterns of magnetization in a magnetizable material to store data. Non-Volatile e.g. Hard Drive, Floppy Disk
         • One pattern/level of magnetism will be a 1, the second will be a 0
         • Has a large Capacity, can be Fast and Reliable, very Cheap
     • Solid State
       • Made out of Microchips (Switches) which store data electronically. Non-Volatile e.g. SD Cards, Memory Cards
         • The state of the switches determine whether a 1 or a 0 is stored
         • Very Fast, Portable, Reliable, Durable, very Expensive
   • A Long-Term Storage for data not currently used e.g. Data, Files, Software
   • data is stored so that it can be accessed later

2. characteristics of secondary storage

   • cost- how expensive the device is
   • capacity- size of data/file
   • speed- how fast the device can read and write data
   • portability- how easy something can be transferred to another device