They behave like those found in normal magnetic storage media. When the crystals in this alloy are heated up using a laser. The surface of the disk is covered in a special alloy. MAGNETO- OPTICAL DISKS This is a storage device in which information is stored using optical and magnetic methods. ĬOMPACT DISK(CD) Click on image for information on how a CD work.ĭIGITAL VERSATILE/VIDEO DISC(DVD) Click on image to read about how DVD work. The drive can detect these differences and converts theses differences into ones and zeroes that can be interpreted by the computer. Under the plastic layer on the reflective side there are areas that reflect light differently. A low-powered laser uses a lens to focus the laser beam on a part of the disk. Both types use the same method to read the data. There are two common types of optical disks : CD and DVD. OPTICAL DISK This is a type of media used for storing data. The faster the access time is the faster the seek time (time it takes the read/write head to get to a specific position on the disk). The access time is the time it takes for the data to be accessed. This is a device that is used to write data to the disk (store it on the disk) and to read data from the disk. Data is read from or written to hard disk using an arm-like device known as a read/write head. HARD DISK A hard disk is a large capacity rigid magnetic disk that is used for storing data. For a long audio cassette tape it can take a minute or two to rewind the whole tape, making it hard to find a song in the middle of the tape. The tape has a beginning and an end, and to move the tape to another song later in the sequence of songs on the tape you have to use the fast forward and rewind buttons to find the start of the song, since the tape heads are stationary. The frames are grouped into blocks or records which are separated from other blocks by gaps. Data is stored in frames across the width of the tape. A recording medium consisting of a thin tape with a coating of a fine magnetic material. MAGNETIC TAPE Magnetic tape is used for storing large amounts of data.
0 Comments
Leave a Reply. |