CD-RW in Software

Creating DataMatrix in Software CD-RW

CD-RW
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To read discs created in a CD-RW drive, CD-ROM drives must contain additional circuitry allowing Automatic Gain Control functions to be used with the laser read head While not an expensive modi cation to CD-ROM drive hardware, it is unlikely that earlier drives can be inexpensively retro tted for this feature Many of the CD-ROM drives currently on the market are equipped with MultiRead capabilities, allowing them to effectively read the contents of CD-RW discs CD-RW was initially more important from a data archiving and storage point of view, but the more universal compatibility of these discs makes it possible to use them for every type of application for which CD-R is used There is, however, one noteworthy exception CD-RW media cannot be used to produce CD one-offs that are to be the basis of preparing a master for mass replication The method of formatting and data storage is signi cantly different than the method used for a CD-R disc written using Disc-at-Once recording (which is the appropriate method to use when creating discs for replication masters) Media costs for CD-RW discs were initially about ve times as expensive as standard CD-R discs, but volume manufacturing and consumer demand have successfully brought prices down Current prices for CD-RW discs are approximately $5 each Bargain brands purchased in quantities of 50 or more can sometimes be found for about $250
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Formatting CD-RW
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One of the disadvantages of using CD-RW media is that the discs must be formatted for use in packet-writing applications the incremental write operations normally used to store data in UDF on CD-RW Depending on the speed of the host computer to which the CD-RW drive is connected, as well as the speed of the CD recorder, the formatting operation can take anywhere from ten minutes up to an hour The xed-length formatting method that is used in this approach divides the storage space on the CD-RW disc into logical sectors of an identical size (unlike the variable-length packet writing used for CD-R) The CD recorder is then able to perform write operations to individual sectors and to erase data, similar to the approach that is used for a hard disk drive or a diskette Without the capability to perform a random erase of data stored in individual sectors on the disc, the storage space will be eventually consumed Early approaches to CD-RW let you delete a le, so that it would no longer appear in the disc directory, but the actual le
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remained resident on the disc There was no way to reclaim the storage space without actually reformatting the CD-RW disc If you don t have the patience to wait for this lengthy formatting to take place, you have three options: Use an application that performs the formatting as a background operation, such as Adaptec s DirectCD Discs can be formatted while you re working on a Word le or crunching numbers in a Quattro Pro spreadsheet Purchase pre-formatted CD-RW discs, which are just becoming available The rst product release of this type was from Verbatim, who introduced pre-formatted 4x CD-RW media in November of 1999 as part of their DataLifePlus Media product line Other manufacturers are following suit Verbatim offers a Sequential CD-RW formatting option that they refer to as quick formatting This method prepares the disc for random CD-RW packet writing and consumes less space for the formatting overhead (approximately 120MB less) Instead of taking 20 minutes or more, quick formatting takes 30 seconds This approach maintains 100 percent compatibility with the UDF standard By using this approach, however, the random erase capabilities of CD-RW are eliminated Files are deleted by removing references to them The actual les are only removed when the disc is fully erased
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As you can see, you have different formatting options available when using CD-RW To achieve the random erase capability, you sacri ce storage space, allowing only 535MB of data on the disc To gain up to 649MB of storage, you can use Verbatim s quick formatting approach, but you lose the capability of physically deleting individual les (although they can still be logically deleted) Verbatim s quick formatting is one of the features available through CeQuadrat s just!burn software, which also includes PacketCD (their implementation of packet writing)
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