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HD DVD-RW is the rewritable disc variant of HD DVD with equal storage capacity to an HD DVD-R. The primary advantage of HD DVD-RW over HD DVD-R is the ability to erase and rewrite to an HD DVD-RW disc, up to about 1,000 times before needing replacement, making them comparable with the CD-RW and DVD-RW standards.
The ISO 13490 standard is an extension to the ISO 9660 format that adds support for multiple sessions on a disc. Since ISO 9660 is by design a read-only, pre-mastered file system, all the data has to be written in one go or "session" to the medium. Once written, there is no provision for altering the stored content.
ISO 9660 is a format mainly used on CDs. The ISO 9660 can be extended with El Torito, Joliet, Rock Ridge, or the Apple ISO 9660 Extensions. El Torito makes it possible to boot from a CD. The Joliet extension by Microsoft makes it possible to have long file names encoded in UCS-2, among other things.
A hybrid disc is an optical disc that has multiple file systems installed on it, typically ISO 9660 and HFS+ (or HFS on older discs). One reason for the hybrid format is the restrictions of ISO 9660 (filenames of only eight characters, and a maximum depths of eight directories, similar to the Microsoft FAT file system).
ISO 13490 is an improvement on this standard which adds support for non-sequential write-once and re-writeable discs such as CD-R and CD-RW, as well as multiple sessions. The ISO 13346 standard was designed to address most of the shortcomings of ISO 9660, [18] and a subset of it evolved into the UDF format, which was adopted for DVDs.
ISO 13490 define a rule for operating systems as to how to read a multiple-session ISO 9660 volume from a CD-R.Instead of looking for the volume descriptor at offset 32,768 (sector number 16 on a CD) from the start of the disc (which would be the default behavior in ISO 9660), programs accessing the disc should start reading from the 16th sector in the first track of the latest session.
ISO images contain the binary image of an optical media file system (usually ISO 9660 and its extensions or UDF), including the data in its files in binary format, copied exactly as they were stored on the disc. The data inside the ISO image will be structured according to the file system that was used on the optical disc from which it was created.
dvd+rw-tools (also known as growisofs, its main part) is a collection of open-source DVD and Blu-ray Disc tools for Linux, OpenBSD, NetBSD, FreeBSD, Solaris, HP-UX, IRIX, Windows and OS X. dvd+rw-tools does not operate on CD media. [1] The package itself requires another program which is used to create ISO 9660 images on the fly.