1.3 storage

1.3 storage

1. secondary storage

   • non volitile
     • meidium storage
       • stores files and programs
         • examples . hard drive , solid states

2. magnetic devices

   • read and written
     • a moving head inside the disk drive
       • they often contain moving parts
         • susceptable to damage
           • either internal or portable

3. solid state devices

   • ssd has no moving parts
     • it retains an electronic charge using logic gates
       • examples, include SD cards and USB memory stick
         • also refered as flash storage

4. optical devices

   • optical media includes CD, DVD and Blu-ray
     • lasers are used to read and write data to a disk
       • data is stored on tracks around the disk
         • as a series of pits represent binary codes

5. cloud storage

   • refers to saving data in an off site location
     • maintained by other party
       • examples include Dropbox, google, microsoft
         • this relies on having an internet connection to be able to upload and download files from cloud server

6. capacity

   • the amount of space that is availiable to store files generally measured in GB

7. speed

   • how quickly a computer can read and write data from a storage device

8. portabillity

   • how easy a device is to be transported. some devices may be permanent hardware, others may be easier to transport

9. durabillty

   • will the device withstand a certain amount of damage without corrupting files

10. reliability

    • the length of time that a device is expected to last for how long will it retain functuallity