File label HDR1 for magnetic tapes

Byte no.	Field name	Length	Field contents
1 - 3	Label name	3	HDR
4	Label number	1	1
5 - 21	File name	17	_..._
22 - 27	Volume serial number <vsn>	6	xxxxxx
28 - 31	File section number	4	0001
32 - 35	File sequence number	4	0001
36 - 39	Generation number	4	0001
40 - 41	Version number	2	00
42 - 47	Creation date <credat>	6	xxxxxx
48 - 53	Expiration date <reldat>	6	xxxxxx
54	Access flag	1	_
55 - 60	Block counter	6	000000
61 - 73	System code	13	_..._
74 - 80	- reserved -	7	_..._

Format of the creation date and expiration date: cyyjjj

c	Code for century: blank = “20th century”; 0 = “21st century”
yy	= Year
jjj	= Julian date (number of the day in the year).

 

Examples

July 3, 1998:_98185

January 10, 2004:004010

H	D	R	1	_	_	_	_	_	_	_	_	_	_	_	_
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
_	_	_	_	_	vsn						0	0	0	1	0
17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32
0	0	1	0	0	0	1	0	0	credat
33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48
reldat					_	0	0	0	0	0	0	_	_	_	_
49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64
_	_	_	_	_	_	_	_	_	_	_	_	_	_	_	_
65	66	67	68	69	70	71	72	73	74	75	76	77	78	79	80