### Old Bacula volume
12	string		BB01		old Bacula volume data,
>20	bedate		x		session time %s

### Current Bacula volume
12	string		BB02		Bacula volume data,
>20	bedate		x		session time %s,
>24	belong		-1		PRE_LABEL,
>24	belong		-2		VOL_LABEL,
>>57	belong		x		version %d,
>>93	string		x		name '%s'