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26 Cards in this Set
- Front
- Back
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ODDs (optical disk drives) |
CD, DVD, Blu-ray(BD), are collectively called ODDs because they use optical disks that are read from, written to, or both. |
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# R designation |
Opticak Drives that have an R designation can only read from a disk |
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#RW/ RE |
Drives that have an RW or RE designation can perform both reads and writes. |
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# DL |
Drives with an DL designation use dual layer technology where two physical layers are available on the same side of the disk. Laser shines through the layer to get to the second layer |
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# optical drives come in a variety of types classified by the x factor. |
1x (single speed)2x (double speed)32x,48x,52x & higher. Optical drives don't operate at a single speed though, the speed varies on the type of media being used |
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Buffer memory |
Holds the extra data in the drive and then constantly sends data to the processor instead of the processor waiting for the drives slow access time. Buffer memory is not enough |
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Random access time |
The amount of time the drive requires to find the appropriate place on the disk and retrieve information |
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MCBF(mean cycles between failures) |
Found by deviding the MTBF by the duration time of a cycle (operations per hour). The MCBF is more accurate because not all drives are used the same amount of time per hour
The lower the number the better the performance |
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Region codes |
Both DVD and BD drives have region codes. The world is devided into six regions for the DVD drive and three for the BD drive. The drive must be set for the correct region code or else the DVDs made for that area won't work |
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DirectX |
Allows people who write software to not have to write code to access specific hardware directly. Translates generic hardware commands into special commands for the hardware, which speeds up development time l. |
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# DirectX |
access DirectX diagnostics tool in Windows by entering dxdiag in the start/run or search dialog box |
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Decoder |
A decoder makes it possible for the disk images to be plated/viewed through software on your computer |
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Laser lens/objective lens |
Responsible for reading information from the disk. If the laser lens gets dust, dirt, or moisture on it, the drive may report data or read errors |
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MIDI (musical instrument digital interface) |
Is used to create synthesized music. A device such as a digital piano keyboard would connect using the MIDI interface and the traditional microphone or line out ports |
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Sound port colors |
Color. Purpose Orange/gold-center speaker or subwoofer Black- rear speaker Light blue- line in Lime green- line out/ front channel speakers Pink- microphone Gray- side speaker |
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Frequency response Sample rate Sample frequency |
The sound card frequency response is dependent on the sample rate. For a good reproduction of sound, the sound wave is sampled at twice the range desired. For example a person's heating us in the 20hz to 20khz range. Twice that is approximately 40,000samples per second |
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Amplification |
Increases the strength of sound. Sound cards usually have built-in applications to drive speakers. Amplification output is measured in watts and most sound cards provide up to four watts of amplification (which is not enough for a full-bodied sound). Boosts sound |
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Power rating |
How loud the volume can go without distorting the sound. This is expressed in watts per channel. Look for the RMS (root-mean-square) power rating. 10-15 watts per channel is an adequate rating for most computer users |
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RMS (Root mean square) |
The most common mathematical method of defining the effective voltage or current of an AC wave |
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Frequency response range |
The range of frequency (sounds) that the speaker can reproduce |
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Shielding |
Cancels out magnetic interference and keeps magnetic interference aeay from other devices. Speakers have a magnet inside them that can cause distortion to a device such as a monitor. The magnets can also cause damage to disks and other storage media. |
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Flatbed (desktop scanner) (Scanner type) |
Can scan books, paper, photographs, and so on; takes up a great deal of desk space |
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Sheetfed (Scanner type) |
Enables a document to be fed through an automatic document feeder similar to a fax machine; good for scanning many documents simultaneously |
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Handheld (Scanner type) |
Slowly moves across the document; user must have patience a steady hand; portable unit |
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Film (Scanner type) |
Scans picture film instead of picture prints |
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Barcode reader (Scanner type) |
Reads barcodes in checkout lanes and in retail establishments; handheld device |
