Analyzing this from the following problems: 1. There is the error messages: the specified drive cannot be accessed or drive failure, etc. 2. The computer is not workinbg smoothly when reading the specified drive. 3. The owner of the computer wants to up-grade the CD-rw or DVD-rw to higher specification for faster performance ..... etc. What is the DVD-RW ? The following information is from the Website : http://en.wikipedia.org/wiki/DVD-RW A DVD-RW disc is a rewritable optical disc with equal storage capacity to a DVD-R, typically 4.7 GB. The format was developed by Pioneer in November 1999 and has been approved by the DVD Forum. Unlike DVD-RAM, it is playable in about 75% of conventional DVD players.[citation needed] The smaller Mini DVD-RW holds 1.46 GB, with a diameter of 8 cm.
The primary advantage of DVD-RW over DVD-R is the ability to erase and rewrite to a DVD-RW disc. According to Pioneer, DVD-RW discs may be written to about 1,000 times before needing replacement. DVD-RW discs are commonly used for volatile data, such as backups or collections of files. They are also increasingly used for home DVD video recorders. One benefit to using a rewritable disc is if there are writing errors when recording data, the disc is not ruined and can still store data by erasing the faulty data.
One competing rewritable format is DVD+RW. Hybrid drives that can handle both, often labeled "DVD±RW", are very popular due to the lack of a single standard for recordable DVDs.
The recording layer in DVD-RW and DVD+RW is not an organic dye, but a special phase change metal alloy, often GeSbTe. The alloy can be switched back and forth between a crystallinephase and an amorphous phase, changing the reflectivity, depending on the power of the laser beam. Data can thus be written, erased and re-written.
What is the CD-RW ? The following information is from the website: http://en.wikipedia.org/wiki/CD-RW
A CD-RW (Compact Disc-ReWritable)is a rewritable optical disc format. Known as CD-Erasable (CD-E) during its development, CD-RW was introduced in 1997, and was preceded by the CD-MO, which was never officially released, in 1988.
CD-RW discs, require a more sensitive laser optics. Also, CD-RWs cannot be read in some CD-ROM drives built prior to 1997. This is why CD-ROM drives of the age must bear a "MultiRead" certification to show compatibility. CD-RW discs need to be blanked before reuse. Different blanking methods can be used, including "full" blanking in which the entire surface of the disc is cleared, and "fast" blanking in which only meta-data areas are cleared: PMA, TOC and pregap, comprising a few percent of the disc. Fast blanking will obviously be much quicker, and is usually sufficient to allow rewriting the disc. Full blanking removes traces of the former data, often for confidentiality. It may be possible to recover data from full-blanked CD-RWs with specialty data recovery equipment[citation needed]; however, this is generally not used except by government agencies due to cost.
CD-RW also have a shorter rewriting cycles life (ca. 1,000) compared to virtually all of the previously exposed types storage of media (typically well above 10,000 or even 100,000), something which however is less of a drawback considering that CD-RWs are usually written and erased in their totality, and not with repeated small scale changes, so normally wear leveling is not an issue.
Their ideal usage field is in the creation of test disks, temporary short or mid-term backups, and in general, where an intermediate solution between online and offline storage schemes is required.
******************************** Hard drive = CD rom drive , or DVD rom drive , or CD-rw drive, or DVD-rw drive , CD-writer drive , or DVD-writer drive, or Cd burner drive or DVD burner drive or hard disk drive
CD-rw = Cd writer = CD burner (they are the same). DVD rw = DVD writer = DVD burner (they are the same).
The drive alphabet names are flexible settings, for example:- Drive A: = Floppy disk drive Drive B: = Alternative Floppy disk drive Drive C: = hard drive, is inside the CPU, there is no tray for the disk. If you set the harddisk to drive C:, the CD or DVD rom will be drive D:, if you set the hardisk to drive C: and D:, the CD or DVD rom will be drive E:, etc. Drive E: = CD rom or DVD rom, there is the tray for the disk. Drive F: = CD-rw or DVD-rw, there is the tray for the disk.
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