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TP(5)									 TP(5)

NAME
       tp - DEC/mag tape formats

DESCRIPTION
       Tp  dumps  files	 to  and extracts files from DECtape and magtape.  The
       formats of these tapes are the same except that	magtapes  have	larger
       directories.

       Block  zero  contains  a	 copy of a stand-alone bootstrap program.  See
       reboot(8).

       Blocks 1 through 24 for DECtape (1 through 62 for  magtape)  contain  a
       directory  of  the  tape.   There  are  192  (resp. 496) entries in the
       directory; 8 entries per block; 64 bytes per entry.  Each entry has the
       following format:

	      struct {
		      char	      pathname[32];
		      unsigned short  mode;
		      char	      uid;
		      char	      gid;
		      char	      unused1;
		      char	      size[3];
		      long	      modtime;
		      unsigned short  tapeaddr;
		      char	      unused2[16];
		      unsigned short  checksum;
	      };

       The  path name entry is the path name of the file when put on the tape.
       If the pathname starts with a zero word, the entry is empty.  It is  at
       most  32	 bytes long and ends in a null byte.  Mode, uid, gid, size and
       time modified are the same as described under i-nodes (see file	system
       fs(5)).	 The tape address is the tape block number of the start of the
       contents of the file.  Every file starts on a block boundary.  The file
       occupies	 (size+511)/512 blocks of continuous tape.  The checksum entry
       has a value such that the sum of the 32 words of the directory entry is
       zero.

       Blocks above 25 (resp. 63) are available for file storage.

       A fake entry has a size of zero.

SEE ALSO
       fs(5), tp(1)

BUGS
       The pathname, uid, gid, and size fields are too small.

7th Edition			 May 15, 1985				 TP(5)
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