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these are distinguished by the "directory" and "volume label" attribute bits. If both of these bits are reset, the entry is a file pointer; if the "directory" bit is set, rpgs it is a subdirectory pointer; if the "volume label" is set, it is a volume label (one or none of which is present in the root directory), rpgs and if both rpgs "directory" and "volume label" bits are set, it is a Long File Name component. Long File Name and volume label entries do not point to data clusters and have a "file length" of zero bytes. Pointer entries contain a name in 8.3 format, the address of the first data cluster (if data is present), the length of the data, the attribute bits, and several other information fields such as timedate stamps, etc. Long File Name entries are associated with the "real" pointer entry by preceding it in the directory, and contain name character data only.
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