.TH TP 5 .SH NAMEtp \- DEC/mag tape formats.SH DESCRIPTIONThecommand.I tpdumps files to and extracts files fromDECtape and magtape.The formats of these tapes are the same exceptthat magtapes have larger directories..PPBlock zero contains acopy of a stand-alone bootstrap program.See.IR bproc (8)..PPBlocks 1 through 24for 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:.nf.IP ""struct {	char	pathname[32];	int	mode;	char	uid;	char	gid;	char	unused1;	char	size[3];	long	modtime;	int	tapeaddr;	char	unused2[16];	int	checksum;};.fi.PPThe path name entry is the path name of thefile 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 modifiedare the same as described under i-nodes (see file system.IR filsys (5)).The tape address is the tape block number of the start ofthe contents of the file.Every filestarts on a block boundary.The file occupies (size+511)/512 blocksof continuous tape.The checksum entry has a value such thatthe sum of the 32 words of the directory entry is zero..PPBlocks above 25 (resp. 63) are available for file storage..PPA fake entryhas a size of zero..SH "SEE ALSO"filsys(5), tp(1).SH BUGSThe.I pathname, uid, gid,and.I sizefields are too small.