BE 2012 Backup Job failed - End marker unreadable problem

Hi,

I have LTO-5 tapes (3 of them) has shared jobs. Here is tape contents:

Tape Labels    Job                  Size

BRN_001        18.06.2014        1,71 TB

BRN_002        18.06.2014        1,71 TB

BRN_002        20.06.2014        1,26 TB

BRN_003        20.06.2014        1,26 TB

Today i run a job which has 647 GB. I tried to write data to BRN_003 tape. When it was writing to tape, i got an error. I re-try to run the job but i'm not able to use BRN_003 tape. It sees this tape as Not appendable (End marker undeadable). I can't erase this tape because i have other files from job 20.06.2014. Can i make that tape re-writable/appendable ? I Don't need to erase files that was written, it was only about 200 MB.

Regards,

Esat.