![]() This is irrelevant with respect to CD-ROMs, because of their small capacity, but it is a reason to avoid using ISO 9660 on DVD-ROMs and other media. ![]() The size of a file is limited to 4GB (2GB in some implementations). The filenames also have a VMS-style version number, so sometimes they are shown with a " 1" suffix. Several extensions, mainly Rock Ridge and Joliet, were developed to mitigate these limitations. At less strict levels, filenames can be up to 31 characters. ![]() At its strictest interchange level, it only allows DOS-style "8.3" names, uppercase only. The standard specifies a very limited filename format. For example, see CUE/BIN format, in which the CUE file specifies the layout of the BIN file. So, the file will consist of blocks that are larger than 2048 bytes (often 2336 or 2352 bytes), with the ISO 9660 data bytes appearing in the middle of each block. This can be necessary when the CD also contains non-ISO 9660 data, such as audio data. However, an actual CD-ROM has additional data before and after the 2048 data bytes, and some CD-ROM image files use a more-raw format that retains this extra data. iso files) are simply a dump of this sector data. The ISO 9660 format uses a sequence of fixed-size sectors, almost always 2048 bytes each.
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