External Memory Devices Essay

Modern external memory devices. External Hard Drive. Flash Drive. Memory Card. Modern external memory devices comparison. Old external memory devices comparison. External memory devices comparison.

Standard CDs have a diameter of 120 millimetres (4.7 in) and are designed to hold up to 74 minutes of uncompressed stereo digital audio or about 650 MiB of data. Capacity is routinely extended to 80 minutes and 700 MiB by arranging more data closely on the same sized disc. The Mini CD has various diameters ranging from 60 to 80 millimetres (2.4 to 3.1 in); they are sometimes used for CD singles, storing up to 24 minutes of audio, or delivering device drivers.“

Prerecorded DVDs are mass-produced using molding machines that physically stamp data onto the DVD. Such discs are a form of DVD-ROM because data can only be read and not written or erased. Blank recordable DVD discs (DVD-R and DVD+R) can be recorded once using a DVD recorder and then function as a DVD-ROM. Rewritable DVDs (DVD-RW, DVD+RW, and DVD-RAM) can be recorded and erased many times.

Back in the day, if you wanted to extend the memory capacity of your PC, you had to have one of these around. They are slim, and are approximately the size of a credit card. There are five types of PC cards: Type I, Type II, Type III, Type IV, and Compact Flash Cards. The difference between each type is its thickness and interface. Nowadays, you’ll rarely find a laptop or notebook that uses a PC card. Instead, you’ll have SD card slots or USB ports available anywhere.