Primary and Secondary storageMindmap

Primary and Secondary storageMindmap

1. Primary storage

   • How does it work
     • Ram
       • random access memory
         • the place in memory where all current programs and data in use is stored
           • quicker to read and write
             • what is the capacity?
               • 500 gigabytes
                 • is it portable?
                   • no
                 • is it durable?
                   • yes
                 • is it reliable?
                   • yes
         • volatile
           • does not remain permanently in memory i
     • Rom
       • read only memory
         • the place in the memory where the "boot up" programs are stored
           • non volatile
         • permanently in the memory
           • even when the computer looses power
             • what is the capacity?
               • 4mb
                 • is it portable?
                   • no
                 • is it durable?
                   • yes
                 • is it reliable?
                   • yes
           • turns the computer on

2. optical storage

   • disks are made small and ligh tot make them portable
     • disks are cheap to manafacture
       • disks are fairly durable meaning that they are safe to store data on for long periods of time
         • some formats such as CD-R and DVD-R mean that data cannot be overwritten
           • disadvantages
             • the storage capacity of disks are relatively small compared to other storage devices
               • in some cases such as blu-ray a special drive is required to read/write the data to and from a disk

3. magnetic storage

   • advantages
     • large store capacity
       • fast access to read and write data
         • fairly inexpensive to manufacture
   • disadvantages
     • data can be lost or altered by magnetic field or mechanical problems
       • can suffer wear and tear

4. solid state storage

   • advantages
     • faster boot up as they do not need to warm up due to having no moving parts
     • can be made to be very compact in size
     • large storage capacity
     • most robust than magnetic due to having no moving parts
   • disadvantages
     • expensive to manafacture
       • have a limited number of times that data can be written to and read from, although this number can be thousand possibly millions

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