Portable Devices

Floppy:
Also called floppy disk (floppy disk in English). A simple view is a square piece of plastic, inside which is the disk. It is a flexible circular disk and magnetic somewhat fragile. Floppy disks are inserted into the computer through the 80 disquetera.En enjoyed great popularity. The software and PC games are distributed in this format. Since at that time the programs and games were less than 1 MB, fit perfectly on the floppy disks.

CD-ROM:
Is a compact disc (in English: Compact Disc - Read Only Memory). It is a compact disc (not flexible as floppy disks) used to store optical information is not volatile, ie, the information entered in a CD in principle can not be erased. Once a CD is written, can not be modified, only read (hence the name, Read Only Memory). A CD-ROM is a flat plastic disc with digital information encoded in a spiral from the center to the edge. Were launched in the mid 80's by reputable companies like Sony and Philips. Microsoft and Apple were two of the major computer companies that used in the beginning. One of the most commonly used storage devices. In fact it was the replacement of the cassettes to store music, and floppy disks to store other data.DVD:
The growth in computer technology is such that even the CD have been small. If 10 years ago floppy disks were too small and it seemed that a CD was too "big", something has changed, as all applications, whether programs, operating systems and video games occupy more memory. 700 MB of traditional capacity of a CD is passed to the 4.7 GB DVD. The first burst of DVD sales appeared to video format to replace VHS classics. The advantages of DVD were clear, more capacity, better quality can be stored. Better data are stored as magnetic tape cassettes were easily wearable. A DVD is much them last, its image quality is better and the sound quality. DVD movies began to become popular in the late 90's.USB memory:
The USB was invented in 1998 by IBM, but it was not patented by him. His goal was to replace floppy disks with greater capacity and transmission speed currently datos.Aunque a CD or DVD can store memory and then delete it and manipulate it as comfortable and USB flash drives are used. They are small devices the size of a cigarette that act almost like a floppy, but with a much higher capacity, which currently range from 64 MB to several gigabytes. Its main advantage is its small size, its strength (the memory itself is protected by a plastic housing and a lighter) and its transmission rate, much faster than floppy disks.