offline-storage Flashcards
give examples of optical offline-storage
CD/DVD/DVD-RAM/blu-ray disks
give examples of solid state device offline-storage
flash memory/memory sticks/SD cards
how do CDs and DVDs work
- they use red light laser to read and write the data
- each disk has a single spiral
why can DVDs hold more data than CDs
they use dual-layering technology (the disks have two individual recording layers)
how do DVD-RAM work
uses number of concentric devices enabling multiple read and write operations to take place at the same time
what makes DVD-RAM ideal for archiving data
they last longer; they can also have direct access because of concentric devices
how do blu-ray disks work
they use blue light to read and write data. They use single polycarbonate discs
what are some adv of blu-ray disks over CD and DVDs
they can carry more data
whats an advantage for blu-ray disks to have polycarbonate disks
prevents reading errors
how do flash memory / memory sticks work
they use solid state technology and usually connect to the device using USB port.
what are adv for flash memory
they are very lightweight which is ideal for transferring files between different computers.
what is important to prevent flash memory sticks from corrupting the data
they need to be read every now and then to retain their data and follow the removal procedure correctly
