INPUTOUTPUT AND STORAGE DEVICES
STORAGE DEVICES HARD DISK SSD AND FLASH MEMORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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better birefringence results
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worse birefringence results
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more data storage
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less data storage
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Detailed explanation-1: -The smaller pits, smaller beam and shorter track pitch together enable a single-layer Blu-ray disc to hold more than 25 GB of information-about five times the amount of information that can be stored on a DVD. Each Blu-ray disc is about the same thickness (1.2 millimeters) as a DVD.
Detailed explanation-2: -Optical disks rely on a red or blue laser to record and read data. Most of today’s optical disks are flat, circular and 12 centimeters in diameter. Data is stored on the disk in the form of microscopic data pits and lands. The pits are etched into a reflective layer of recording material.
Detailed explanation-3: -A DVD drive uses a laser to read data that have been encoded onto a DVD. Because the DVD laser emits red light at shorter wavelengths than those used for other optical discs, such as CDs, a DVD can achieve greater storage density.
Detailed explanation-4: -Blue light has a shorter wave-length than red light (used with CDs and DVDs). Using a blue laser allows more data to be placed closer together on a Blu-Ray disc, than on a DVD or CD, so Blu-Ray has a much higher storage capacity than these older discs.