Components of the CD DriveFitness Gear & Equipment
Components of the CD Drive
The CD drive consists of different parts that enable it to read data from the disc. The Computer CD drive is a precision device because the timing of sending the laser beam and collecting the laser beam reflected from the CD must be precise. A misalignment in the structure or working of any part of the CD drive will result in an error in reading the data from the CD.
The optical head of the CD-ROM drive consists of a read laser and an optical sensor. The read laser targets a laser beam on the disc. The optical sensor collects the reflected laser beam from the disc.
The optical head is a very delicate and expensive part of the CD-ROM drive. It is also a high precision part of the Computer CD drive because any deviations in the alignment of the optical head, will not allow the CD drive to read data from the disc properly.
The CD Writer has two lasers, one for reading data from the CD disc and one laser for writing data on the CD disc. The strength of the write laser is very strong.
The head actuator moves the optical head forwards and backwards from the center of the CD disc to the outer end of the disc. This allows the optical head to access all the parts of the CD disc. The head actuator moves the optical head, away from the center of the CD disc, using very small intervals to follow the minute tracks on the CD.
The spindle motor catches the CD when it is inserted in the CD drive and spins it. The circumference of the CD at its center is less than the circumference CD at the outer edge.
This means that more data is stored on the CD near the outer side than the inner side. The optical head covers more distance at the outer track of the CD-ROM disc, to enable the CD-ROM drive to read data from the CD-ROM disc at a constant speed. The spindle motor reduces the spinning speed as the head actuator moves from the center outward.
The loading mechanism loads the CD in the Computer CD drive. The frequently used method for loading the CD drive is the tray. The CD drive has an eject button that opens and closes the CD drive tray. The CD is placed on the CD drive tray after opening it.
Computer CD drives also uses the caddy system to load the CD. The CD is inserted in a device known as a caddy. The caddy is a plastic case with a metal shutter. The caddy with the CD in it is inserted in the Computer CD drive, just as a floppy disk is inserted in a floppy disk drive.