much higher quality; similarly, DVD-R releases that must be re-encoded often use 6 or 8 passes to get the best quality. When choosing the file format, platform compatibility is important. Formats are chosen such that they can be used on any major platform with little hassle. Some formats such as CloneCD can only be used on Windows computers, and these formats are generally not chosen for use in the standards. Packaging Next, the standard usually talks about how to package the material. Allowed package formats today are limited to RAR and ZIP, of which the latter is used only in 0-day releases. The sizes of the archives within the distributed file vary from the traditional 3½" floppy disk (1.44 MB) or extra-high density disk (2.88 MB) to 5 MB, 15 MB (typical for CD images) or 20 MB (typical for CD images of console releases), 50 MB files (typical for DVD images), and 100 MB (for dual-layer DVD images). These measurements are not equivalent to traditional measurement of file size (which is 1024 KB to a MB, 1024 MB to a GB); in a typical DVD release, each RAR file is exactly 50,000,000 bytes, not 52,428,800 bytes (50 megabytes in binary prefix). Formerly, the size of volumes were limited by the RAR file naming scheme, which produced extensions .rar, .r00 and so on through .r99. This allowed for 101 volumes in a single release before the naming switched to s00, s01 and so on. For example, a DVD-R image (4.37 GiB), split into 101 pieces, produces volumes smaller than 50 MB. The new RAR naming format, name.part001.rar, removes the limit, although the individual split archives continue to be 50 MB for historical reasons and because the old RAR naming format is still being widely used. Different compression levels are used for each type of material being distributed. The reason for this is that some material compresses much better than others. Movies and MP3 files are already compressed with near maximum capacity. Repacking them would just create larger files and increase decompression time. Ripped movies are still packaged due to the large file size, but compression is disallowed and the RAR format is used only as a container. Because of this, modern playback software can easily play a release directly from the packaged files, and even stream it as the release is downloaded (if the network is fast enough). MP3 and