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Capabilities of computers (In general) 1.) Ability to perform certain logical and mathematical functions. 2.) Ability to store data and/or information. 3.) Ability to retrieve data and/or information. 4.) Ability to search data and/or information. 5.) Ability to compare data and/or information. 6.) Ability to sort data and/or information. 7.) Ability to control errors. 8.) Ability to check itself. 9.) Ability to perform a set of tasks with speed and accuracy. 10.) Ability to do a set of tasks repetitively. 11.) Ability to provide new time dimensions. 12.) Excellent substitute for writing instrument and paper. Limitations of computers (In general) 1.) Dependence on prepared set of instructions. 2.) Inability to derive meanings from objects. 3.) Inability to generate data and/or information on its own. 4.) Cannot correct wrong instructions. 5.) Dependence on electricity. 6.) Dependence on human interventions. 7.) Inability to decide on its own. 8.) Not maintenance-free. 9.) Limited to the processing speed of its interconnected peripherals. 10.) Limited to the available amount of storage on primary data storage devices. 11.) Limited to the available amount of storage on secondary data storage devices. 12.) Not a long-term investment. About the capabilities and limitations of computers
About a computer case A computer case also known as a "computer chassis", "tower", "system unit", "base unit" or simply "case" and sometimes incorrectly referred to as the "CPU" or "hard drive", is the enclosure that contains most of the components of a computer (usually excluding the display, keyboard and mouse). Cases are usually constructed from steel (often SECC — Steel, electrogalvanized, cold-rolled, coil) or aluminium. Plastic is sometimes used, and other materials such as glass,wood and even Lego blocks have appeared in home-built cases.
About a CD Compact disc, or CD for short, is a digital optical disc data storage format. The format was originally developed to store and play back sound recordings only (CD-DA), but was later adapted for storage of data (CD-ROM). Several other formats were further derived from these, including write-once audio and data storage (CD-R), rewritable media (CD-RW), Video Compact Disc (VCD), Super Video Compact Disc (SVCD), Photo CD, PictureCD, CD-i, and Enhanced Music CD. Audio CDs and audio CD players have been commercially available since October 1982. Standard CDs have a diameter of 120 millimetres (4.7 in) and can hold up to about 80 minutes of uncompressed audio or 700 MiB (actually about 703 MiB or 737 MB) of data. 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. At the time of the technology's introduction it had much greater capacity than computerhard drives common at the time. The reverse is now true, with hard drives far exceeding the capacity of CDs. In 2004, worldwide sales of CD audio, CD-ROM, and CD-R reached about 30 billion discs. By 2007, 200 billion CDs had been sold worldwide. Compact discs are increasingly being replaced or supplemented by other forms of digital distribution and storage, such as downloading and flash drives, with audio CD sales dropping nearly 50% from their peak in 2000.
About a CD-ROM Drive CD-ROM discs are read using CD-ROM drives. A CD-ROM drive may be connected to the computer via an IDE (ATA), SCSI, SATA, FireWire, or USB interface or a proprietary interface, such as the Panasonic CD interface. Virtually all modern CD-ROM drives can also play audio CDs (as well as Video CDs and other data standards) when used in conjunction with the right software.