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Mount Rainier

A format for providing platform interoperability and native OS support for CD-RW and DVD+RW disks. The "MRW" or "CD-MRW" format enables files to be saved to RW disks as if they were hard disks (from any Save dialog or dragged and dropped). Mount Rainier supports the UDF file system and automatically formats a blank disk when it writes it for the first time. It allows the disk to be ejected before it is fully formatted by "de-icing" it, which saves the data necessary to continue the format later.

Mount Rainier also supports defect management, which masks bad sectors and writes the data into spares like a hard disk. In addition, it reduces block size from 64KB to 2KB for more efficient use of disk space. A driver can be added to legacy CD-ROM and CD-RW drives for read compatibility with MRW disks. See CD-RW.


(CD-ReWritable) A rewritable CD technology. CD-RW discs look like other CD media, but with close inspection, they have a more polished surface with a very dark blue-gray cast. Similar to a hard disk, the media must be formatted before use, and files can be added and deleted. However, unlike a hard disk platter, which can be rewritten millions of times, CD-RWs have a maximum limit of 1,000 rewrites.

In practice, the term "CD" refers to all CD formats. The phrase "rewrite the data on the CD" really means "rewrite the data on the CD-RW."

CD-RW Drives Support All CD Formats
The CD-RW drive is the most versatile CD drive, and most new CD drives are CD-RWs. Not only can a CD-RW drive read all CD formats and write CD-RWs, it can be used to burn "write once" CD-R media. CD-RW uses phase change technology to alter the reflectivity of the disc surface, but this reflectivity is lower than other CD formats, and old CD-ROM drives that lack MultiRead capability cannot read them. For detailed speed ratings of CD-RW drives, see CD-ROM drives. See Mount Rainier, phase change disc, UDF, DVD and optical disc.

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