storage devices

storage devices

1. Hard disks

   • read/write head passes over rotating surface of the disk and adds/reads data
   • All computer have atleast one internal hard drive
   • Can be external
   • Large memory capacity
   • Can be damaged and stop working

2. Magnetic tape

   • Large memory capacity for cheaper price
   • older form of storage
   • Hard to locate one piece of data

3. USB Sticks

   • Smaller capacity to hard disks
   • data stored on a computer chip
   • smaller more mobile
   • Prone to being lost

4. Memory cards

   • same as USB but on a card
   • In smartphones, digital cameras, etc
   • small size, large memory
   • used a limited number of times
   • can be used to steal important data

5. Optical disks

   • data stored on bumps and pits on the surface
   • CD
     • older type
     • Max capacity 650-700 MB
     • CD-R = Burn unremovable data into the disk
     • CD-RW = Add and delete data
     • CD-ROM = cannot be edited (read only)
   • DVD
     • 4.7 GB (6 CDs)
     • DVD+ = add data
     • DVD- = add data
   • Blu-ray
     • 10 X DVD amount
     • HD Movies
     • Ultra Density disks (UDO) = 10 X Blu-ray
   • small and portable
   • Easily stolen
   • Old players cant use new disks

6. Remote storage

   • cloud storage
   • Mainly used for back-ups
   • Safer way of storing important data