MAC OS – Unit A Page:14-15 Understand Storage Media.

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Presentation transcript:

MAC OS – Unit A Page:14-15 Understand Storage Media

Types of a Storage Media Because RAM stores data only when the computer is on, the computer needs a permanent memory, Types of Optical Devices: 1. Magnetic Storage Devices. 2. Optical Storage Devices 3. Flash Memory

Magnetic Storage Devices Magnetic Storage devices are hard disk, tape and floppy disks. Hard disk is the most common type of magnetic storage media. It contains several magnetic oxide covered metal patterns that are sealed in a case inside the computer. Tape is much slow to be used for every day computer tasks. Tapes are used to make backup copies of data stored on hard disks. Tape provides inexpensive, though slow, archive storage for large companies Floppy disk is a flat circle of magnetic metal-oxide enclosed in a hard plastic case. Floppy disks are also called 3 ½” disks because of the size of the plastic case.

Optical Storage Devices .Optical Storage Devices are polycarbonate discs coated with a reflective metal on which data is recorded using laser technology as dark spots in the surface of the disc.  The data that these spots represent can be read with a laser light  CD = Compact disk is the first standard output optical device available for personal computers  DVD = Digital video disk is the same size as the CD that’s stores between 4.7 and 15.9 GB depending on whether the data is stored on one or two sides of the disc  Blu-ray DVD or HD-DVD are new types of optical storage devices that are capable of storing 15GB to 50 GB and storing high definition video

Flash Memory  Flash memory is similar to ROM except that it can be written more than once.  Flash memory cards are small portable cards encased in hard plastic to which data can be written and rewritten. They are used in cameras, handheld computers and other devices  USB flash storage device also called USB drive or Flash drive used for personal computers are available in different sizes.  USB drives are available in storage capacity of 30 MB to 16 GB of data.  USB drives plug directly into the computer through a port.  Page 14 Figure: A-15 and A-16  Page 14: Erasing and rewriting on CDs and DVDs