what are the three main categories of optical laser discs?
159512
There are three main types of optical media: CD, DVD, and Blu-ray disc. CDs can store up to 700 megabytes (MB) of data, and DVDs can store up to 8.4 GB of data.
795696
['solid state storage devices, such as USB memory sticks.', 'optical storage devices, such as CD, DVD and Blu-ray discs.', 'magnetic storage devices, such as hard disk drives.']
404334
Magnetic storage devices use "read/write heads," electromagnets that detect (read) or change (write) the magnetization patterns on the disk. Optical storage devices use lasers to read the reflections in the disk or "burn" the data pattern into the disks.
867123
Lasers are commonly designated by the type of lasing material employed. There are four types which are: solid state, gas, dye, and semiconductor. The characteristics of each type will be described. Solid State Lasers employ a lasing material distributed in a solid matrix.
358526
Pumps can be classified by their method of displacement into positive-displacement pumps, impulse pumps, velocity pumps, gravity pumps, steam pumps and valveless pumps. There are three basic types of pumps: positive-displacement, centrifugal and axial-flow pumps.
1389243
['Print.', 'Screen.', 'Audio.', 'Microform.', 'CD-ROM or DVD.', 'Electronic.', 'Web-based documents.']
1405926
But the laser disc format is analog; DVDs are digital (see How Analog and Digital Recording Works). ... Laser discs are only used for prerecorded movies, and they are larger, about 12 inches (30.5 centimeters) in diameter, instead the 5-inch (12.7-centimeter) diameter of DVDs.
524842
The light emitted from a laser is monochromatic, that is, it is of one wavelength (color). In contrast, ordinary white light is a combination of many different wavelengths (colors).
731539
The three main types are reflecting telescopes, refracting telescopes, and catadioptric telescopes. Radio telescopes collect and focus radio waves from distant objects.
1159317
['Stereo Microscope.', 'Compound Microscope.', 'Inverted Microscope.', 'Metallurgical Microscope.', 'Polarizing Microscope.']
1277650
['Light Compressor.', 'HDR Darkroom.', 'HDR Express.', 'Bracketeer.']
399307
['Category 1 – Pre-Manufacturing - 3D primary structural systems.', 'Category 2 – Pre-Manufacturing - 2D primary structural systems.', 'Category 3 – Pre-Manufacturing - Non systemised structural components.', 'Category 4 – Pre-Manufacturing - Additive Manufacturing.']
1025408
['Laser Printers.', 'Solid Ink Printers.', 'LED Printers.', 'Business Inkjet Printers.', 'Home Inkjet Printers.', 'Multifunction Printers.', 'Dot Matrix Printers.', '3D Printers.']
1377611
['Bernoulli drive (obsolete)', 'Disc drives: Blu-ray, CD-R, CD-ROM, CD-RW, and DVD.', 'Flash drive.', 'Floppy disk drive (obsolete)', 'Hard drive.', 'Local drive.', 'LS-120 (obsolete)', 'Network drive.']
1005894
Blu-ray Discs. Region A/1: North America, Central America, South America, Japan, North Korea, South Korea, Taiwan, Hong Kong and Southeast Asia. Region B/2: Europe, Greenland, French territories, Middle East, Africa, Australia and New Zealand. Region C/3: India, Nepal, Mainland China, Russia, Central and South Asia.
739964
Monochrome laser printers use one black toner cartridge. Color laser printers typically use four cartridges: cyan, magenta, yellow, and black. Color printing uses more toner to print a single page, which significantly increases the cost per page.
603410
The key difference between optical storage media, such as CDs and DVDs, and magnetic storage media, such as hard drives and old-fashioned floppy disks, is in how computers read and write information to them. One uses light; the other, electromagnetism. Hard drive disks with read/write heads.