COMPUTER HARDWARE
STORAGE DEVICES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Has moving header to read the data
|
|
|
is read by bouncing the laser beam off the surface off the medium.
|
|
|
data is read directly from Microchip
|
|
|
Uses light and pin to read the data
|
Detailed explanation-1: -The data on the storage medium is read by bouncing the laser beam off the surface of the medium. If the beam hits a dot it is reflected back differently to how it would be if there were no dot. This difference can be detected, so the data can be read.
Detailed explanation-2: -The inner face of CDs is scored with pits several micrometers long, which are arranged in a continuous spiral, and represent recorded data. Laser light is focused on these pits, and data is read by picking up the reflected light. DVDs work according on essentially the same principle.
Detailed explanation-3: -A CD-ROM drive uses a low-power laser beam to read digitized (binary) data that has been encoded in the form of tiny pits on an optical disk. The drive then feeds the data to a computer for processing.
Detailed explanation-4: -A low-power laser scanner is used to “read” these pits, with variations in the intensity of reflected light from the pits being converted into electric signals. This technology is used in the compact disc, which records sound; in the CD-ROM.
Detailed explanation-5: -An optical disk drive uses a laser beam to read the data from the disk as it is spinning. It distinguishes between the pits and lands based on how the light reflects off the recording material. The drive uses the differences in reflectivity to determine the 0 and 1 bits that represent the data.