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HPFS Fnode layout
An Fnode is 512 bytes with fixed size info:
- Unique binary signature string 'ae 0a e4 f7'
- Sectornumber (LSN) for Parent directory
- First 15 characters of the filename (short name)
- Length of filename, and length of the filedata
- Type of the Fnode, either File or Directory
- Allocation information, max of 8 LSN+size pairs
- DASD limits (user quota, HPFS386 only)
Then, variable sized info may be present,
either in the Fnode itself or externally:
- Extended-attribute data (.longname, .icon etc)
- Access Control Lists (HPFS386 only)