|
 |
How Cd-rom Drives Function
CD drives shine a laser onto the disk and a
photo detector picks up the reflections. A pit
disperses the beam, and a land, or flat spot,
mirrors the beam. This data is deciphered into
0's and 1's and sent to the CPU.
CDs use a long twisting groove, a great deal like
an LP. This is called CLV, or constant linear
velocity recording. To continue this constant
speed, special drive rotating device spin the
CD slower and slower as the read/write head gets
nearer to the border of the disk. Other drives,
like MO drives, as well as floppy drives, use
the track system, a series of concentric circles
around the disk. This track and sector system
is called CAV, or constant angular velocity, recording.
|
|
|
|
