Mirka Gold Linkrol Disc 120D

OPTICAL DISK

Optical disk is an electronic data storage medium from which data is read and written to by using a low-powered laser beam. It is flat, circular, plastic or glass disk on which info is stored in the form of light and dark pits. The laser beam reads the pits and the data may be accessed. There are three basic types of optical disks:

o Read-only optical disks: The optical disks, which are recorded at the time of develop and can not be erased. CD, CD-ROM, DVD-ROM, and DVD-Video are the read-only disks.

o WORM: WORM stands for write-once, read many. The optical disks that may be recorded by the user only once but cannot be erased. After they have been recorded once, they behave like a read-only optical disk CD-R, DVD-R, and WORM disks are write-once.

o Rewritable/Magneto-optic disks: The optical disks that may be erased and written to with the new information. CR-RW, DVD-RAM, DVD-RW, and magneto-optic disks and Data play are rewritable. Rewritable disks use magneto-optic or phase alter technology.

An optical disk offers a lot of vantages over magnetic storage media.

o Highest storage capacity

o Low cost per Megabyte of storage

o Environmental condition tolerance

o High info stability

o Long media life

An optical disk has much more storage capacity on the order of gigabytes, than a magnetic disk. It may hold up to 6GB of data in comparison to 1.44 MB of a diskette. Optical disks are inexpensive to manufacture. Data stored on optical disks is immune to power surges or magnetic disturbances, such as head crashes or corruption form stray magnetic fields. Hence, they provide high info stability. Optical disks are less vulnerable to extremes of hot and cold as

compared to the magnetic disks. Optical disks have long media life than magnetic disks.

OPTICAL STORAGE DEVICES

CD-ROM

CD-ROM: is an abbreviation of Compact Disc Read-Only Memory. A CD-ROM is a CD that holds computer data, which cannot be read or rewritten. In

computers, CDROM is the most normally employed optical storage technology. CD-ROM is a compact disc that holds information, which is accessible by a computer. It is composed of polycarbonate plastic, thin reflective metal layers, made of aluminium and a lacquer coating. Data is stored on the disc as a series of light and dark pits; the light percentage refers to the spaces amidst the pits. A laser beam reads the pits and the data may be accessed.

CD-ROM is an adaptation/EXTENSION of the compact disc that is designed for music storage and playback. The format of CD-ROM is very similar to an audio CD; the only divergence being the standards employed to store data. A ordinary 120 mm CD-ROM holds up to 700 MB of data, or with regards to 70 minutes of audio. This may mean that One CD may comprise over one thousand novels; an intermediate novel being composed of 60, 000 words. Once the data is written to a standard CD-ROM disc, it cannot be altered or rewritten.

A CD-ROM may be read using a CD-ROM drive, which is closely mutual on the personal computers. A CD-ROM drive may be connected to the computer in assorted dissimilar ways depending on the type of interface, such as:

o IDE (ATA)

o SCSI

o SATA

o Firewire

o USB

Almost all innovative CD-ROM drives may play audio as well as video CDs.

CD-ROM STANDARDS

CD-ROM format provides an great solution to the problem of storing huge digital files. Several formats are employed for selective information stored on CD-ROMs. These include Red book standards for audio-CD, White Book and Yellow Book for CD-ROM. An ISO 9960, which defines the popular file scheme of a CD-ROM is due to be substituted by ISO 13490.

CD-ROM FORMAT

One CD-ROM sector holds 2352 bytes, which is further divided into 98 24-byte frames. A CD-ROM holds a third layer of Reed-Solomon error correction in order to achieve bettered error correction and detection.

Mode-1 CD-ROM: It has full three layers of error correction data, which holds 2048 bytes of the available 2352 per sector.

Mode-2 CD-ROM: It is largely used for video files, which holds 2336 user-available bytes per sector.

CD-ROM SPEEDS AND USES

+ Early CD-ROM drives were known as single-speed and could read the info at the speed of 150 KBps.

+ CD-ROM drives may transfer selective information up to the speed of 7800 KBps

+ CD-ROM may store audio, video, text and program instructions. It is applied to store software programs.

DVD-ROM

DVD-ROM: is an abbreviation of Digital Versatile Disc- read only memory. DVD-ROM is an optical disc storage media format that may be used for data storage, which includes movies with high video and sound quality. DVD-ROM is a non-volatile optical storage medium similar to CD-ROM, which holds computer selective information that can not be erased or rewritten. These DVDs are read-only disks that have storage capacity for 133 minutes of high quality video, in format, and audio full- length feature film. The discs are pressed in a similar fashion as the CDs. The reflective surface is gold or silver colored.

DVD-ROM may be accessed using a DVD-ROM drive attached to the personal computer. DVD-ROM drives are backward compatible, i.e. they are also competent of reading CD-ROMs and audio CDs as well. The DVD-ROM supports disks with capacities of 4.7 GB to 17 GB and access rates of 600 KBps to 1.3 MBps. A usual DVD disc store up to 9.4 GB of data. DVD-ROMs are of same size as a compact disc, but holds selective information with regards to 7 times more. DVD may store that much of info because both the sides of a disc are used, with sophisticated info compression technologies.

DVD-ROM is a variation of CD-ROM that is being used in place of CD-ROMs in a lot of personal computers. All DVD-ROMs incorporate a file system, UDF, which is an extension of the ISO 9660 Standard used for info CDs.

CD-RW

CD-RW is an abbreviation of compact disc-rewritable. It is a recordable CD format that may be erased and rerecorded multiple times, just like a floppy disk or a hard disk. It is a rewritable version of CD-ROM. CD-RW disc is round plastic, in regards to 5 inches in diameter. CD-RW disks may be played or recorded in the CD-RW drive only. These disks behave unusable when put in a regular CD-drive or a CD-R drive can not be played. A CD-RW drive may read everything except a DVD.

A CD-RW may hold 650 Megabytes of data (unlimited number of times) written by a CD-RW drive. CD-RW cannot be selectively overwritten but may be extended. CD-RWs must be closed before they may be read in a normal CD-ROM drive. CD-RW disks cannot be read using a CD-ROM drive built before 1997. CD-RWs may be randomly read and written because of the variation of UDF format. CD-RW disks and drives are more pricey than a regular CD-ROM drive or media. A CD-RW disc may be read optically by laser light.

DVD-RW

DVD-RW: stands for Digital Versatile Disk-Rewritable. It is a re-recordable optical disc, which may record up to 4.7 GB per side in a similar fashion to a CD-RW. DVD-RW supports sequential read/write access i.e. the device may need to wait for the rectify emplacement in a constantly revolving medium. The selective information stored on DVD-RW may be erased and rerecorded over multiple times without damaging the medium.

DVD-RW is a phase-change erasable format based on DVD-R, using similar mark length, track pitch and rotation control. The format is supported by the DVD Forum. DVD-RW is also called “DVD Dash RW” and “DVD Minus RW”.

DVD-RW may be played in a lot of DVD drives and players. Depending on quality, recording time varies from 1 hour to 6 hours.

If these optical disk gets damaged then the stored selective information becomes in accessible, these lost or damaged selective information may be recovered by usinig Stellar Phoenix CD Data Recovery Software

Mirka Gold Linkrol Disc 120d

Bulldog Gold 23 Series. Premium Paper for finishing as well as heavy stock removal. Durable aluminum oxide grain delivers a Fast, peculiarly Long lasting Cut. High strength Resin bonded system.

Mirka Gold Linkrol Disc 120d Pic

Mirka Gold Linkrol Disc 120d Pic

Mirka Gold Linkrol Disc 120d Photo

Mirka Gold Linkrol Disc 120d Pic