Tape details when it was backed up in December 2014. 

Location            : Slot-20
MediaLabel          : Database Backup (Half Yearly | Tape) -00000002
LibraryName         : Hewlett Packard MSL G3 Series library  (x64 based)
TapeBarcode         : XXXXXX
IsOffsiteReady      : True
ProtectionGroupName : Database Backup (Half Yearly | Tape)

I used '|' in protection group name, when I check below MS KB blog I came to know that special characters aren't allowed. So now tape barcode is readable but its showing unrecognized. Is there any way to restore data ?

http://blogs.technet.com/b/dpm/archive/2010/06/07/dpm-2007-tapes-are-labeled-as-unrecognized-after-just-previously-writing-to-them-and-removing-them-from-the-library.aspx

• Edited by Vijay MC 8 hours 31 minutes ago

Could you check if the TechNet article helps?

https://technet.microsoft.com/en-us/library/bb808923.aspx