Optical disk drives

Floppy disk driver Telephone/cellular Consumer electric Head phone Spindle motor Floppy disk drive Optical disk drive Small appliance High Tech kitchen appliance Cordless power tool... 

Potyrailo, R. A. Morris, W. G. Leach, A. M. Hassib, L. Krishnan, K. Surman, C. Wroczynski, R. Boyette, S. Xiao, C. Shrikhande, R Agree, A. Cecconie, T., Theory and practice of ubiquitous quantitative chemical analysis using conventional computer optical disk drives, Appl. Opt. 2007,46, 7007-7017... 

R. A. Potyrailo, W. G. Morris, A. M. Leach, T. M. Sivavec, M. B. Wisnudel, and S. Boyette, Analog Signal Acquisition from Compnter Optical Disk Drives for Quantitative Chemical Sensing, Analytical Chemistry, vol. 78, no. 16, pp. 5893-5899, Aug. 2006. 

Optical Disk Drive Device that can read one or more types of optical disks. 

FIGURE 14.13 Block diagram of the servocontrol system for an optical disk drive. 

FIGURE 14.15 A functional block diagram of an optical disk drive describing the key electrical functions and interfaces. Some of the abbreviations are VFO is the variable field oscillator, which is used to synchronize the data, RD amp is the read signal amplifier, WR amp is the write signal amplifier, PD fixed is the photodetextor assemply, and LD head is the laser diode. 

Potyrailo R, Morris W, Leach A, Sivavec T, Wisnudel M, Boyette S (2006) Analog signal acquisition from computer optical disk drives for quantitative chemical sensing. Anal Chem... 

For precision applications where the work is especially sensitive to system contamination (e.g., disk drive, optical, or electronic components), point-of-use filtration is required. Currently absolute pleated filters of 0.1 micron rating are recommended. 

Another type of removable media drive is the CD-ROM drive (see Figure 4.5). These drives are slightly different from other storage media in several ways. First of all, they have a different way of reading information than magnetic media disk drives do. Because CD-ROM drives use laser light to read the information from the media, they are described as optical drives. 

There are several pieces of backup hardware that are currently available. You can back up your information to magnetic tape, Digital Audio Tape (DAT), Digital Linear Tape (DLT), optical disk, removable hard disk, and many other removable media. The key here is that all of these media can be removed from the drive and stored in a safe place. 

Blu-ray An optical disk format. Developed by a consortium of over 180 companies led by Sony, Blu-ray disks are intended to supersede the DVD both for the distribution of video and for data storage - they can hold up to 25 Gb on each ot up to two layers. Blu-ray achieves this greater capacity by using a blue (actually, a violet) laser rather than the red laser used for DVDs the shorter wavelength allows the beam to be focused more precisely and so more data to be packed into a given space. Currently (2009) some high-deflnition DVDs have been released in Blu-ray format, and computer Blu-ray drives are becoming available. 

Optical media is more durable than electromagnetic tape and is less vulnerable to environmental conditions. With the exception of Blu-ray Discs, the speed of data retrieval is considerably slower than that of a computer hard drive. The storage capacity of optical disks is significantly less than that of hard drives. Another, less common form of optical storage is optical tape, which consists of a long, narrow strip of plastic upon which patterns can be written and fi-om which the patterns can be read back. 

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