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Recording to rewritable discs does not require the same attention to uninterrupted data ow as does writing to write-once media Data written to CD-RW and DVD-RAM media can be corrected by rewriting Performance issues become less important since mistakes can be remedied The bene ts of packet writing also increase the utility of rewritable media, since the overhead associated with storing data that has been written incrementally is large eliminated The widespread acceptance of CD-RW (Compact Disc - Read/Write) provides an alternative to the write-once approach of conventional CD-R systems CD-RW media uses a six-layer system that includes two dielectric layers and a recording layer that captures phase changes between a crystalline state and an amorphous state (of reduced re ectivity) The laser
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used in this technology pulses between two different power levels one to record data and the other to return the media to an unrecorded state MultiRead-capable CD-ROM players can read the CD-RW discs, making the technology useful for both in-house backup and archiving of les, as well as distribution of data Similarly, the Super MultiRead speci cation is under design for DVD media, which would allow rewritable DVD+RW discs to be read in specially equipped mainstream players and DVD-ROM drives As of press time, this speci cation is still being nalized The rewritable formats open up optical recording to more conventional storage uses, making discs a practical alternative to storing large amounts of data on hard disk drives or magnetic tape The primary limitation to this form of storage is that playback is restricted to a smaller range of devices than the full universe of CD-ROM drives or DVD player/ DVD-ROM drives You also cannot use rewritable media as a method of producing one-off discs for replication purposes Replication facilities receiving data on CD-RW or DVD-RAM have to pull individual les from the disc and premaster to tape, CD-R, or DVD-R before a glass master for replication can be produced The extra step can add a great deal of unnecessary expense to a replication project and adds the potential for possible le errors during data transfers and restructuring of disc contents
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Formatting of a compact disc is irregular in comparison with a formatted hard disk drive The physical contents of a hard disk drive are laid out in concentric tracks, each utilizing an identical sector format The hard disk's logical le system contents are periodically updated and maintained in a le allocation table of some sort Bad blocks on the hard disk surface due to surface irregularities can be marked as non-writable areas and excluded from the data map In comparison, a single-session compact disc has one table of contents, written once Also, unlike the regular, preformatted sectors on a hard disk, each compact disc sector can contain a different number of data bytes depending on its contents Error-correction techniques and embedded codes vary by type of sector Mixed-mode discs can contain purely audio information following a track of computer data Multi-session recording builds an ongoing structure that references the contents of earlier recorded les As recording is taking place on a compact disc, the system is building a series of roadmaps and pointers to encompass the
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data If a roadmap points in the wrong direction when a disc is being read, the data that it was supposed to identify becomes inaccessible
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Multi-session reading and writing is covered in Orange Book, but the means of execution is not speci ed in detail Because of this, the original implementations varied depending on each manufacturer s interpretation Incremental write operations are subject to control by the CD recorder's feature set, by driver software, and by the premastering application Some applications are more lenient than others in regard to interruptions of a write operation Most current implementations have turned to packet writing as a technique for recording smaller quantities of data at a time and for being able to bridge interruptions in the data ow without ruining the media There are still variations from manufacturer to manufacturer as to how this process is carried out, and most companies include a software driver that is used as a bridge between the computer operating system and the packet-written data on disc For example, Adaptec s DirectCD program is an example of a tool that supports seamless reading and writing of data on rewritable and recordable discs For packet writing to be supported, the CD recorder must be equipped with hardware that is compatible with this process A rmware upgrade cannot be accomplished for a CD recorder that lacks the appropriate hardware components to make it capable of packet writing When using packet writing, data is written to disc in small increments predictably called packets that can be as small as a single le Unless using conventional multisession write operations that require as much as 23MB of overhead for creating a single session, packet writing makes more ef cient use of the disc storage space, adding minimal information to the disc to support le storage and retrieval Packet writing opens up recordable-CD applications to many mainstream uses, such as simple le storage and distribution within organizations, or network backups that are performed by administrators Depending on the package and the implementation, packet writing can be applied to both CD-R and CD-RW applications Those applications that are designed for CD-RW typically use the UDF standard for the le system CD-R implementations often employ ISO 9660, for more universal playback All of the packet writing solutions require that a disc be formatted before use whether you are writing to CD-R or CD-RW media The formatting
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