DOWN'ing drive index

Hi All

After running 2 minutes automatically drive is downing and getting below error. Please suggest me on this.

3/7/2016 11:34:47 AM - job 3463 was restarted as job 3467
3/7/2016 11:34:50 AM - started process bpbrm (6060)
3/7/2016 11:34:50 AM - connecting
3/7/2016 11:34:51 AM - connected; connect time: 00:00:01
3/7/2016 11:35:12 AM - started process bptm (6064)
3/7/2016 11:35:12 AM - started process bptm (2972)
3/7/2016 11:35:12 AM - mounting 0045L3
3/7/2016 11:36:01 AM - mounted; mount time: 00:00:49
3/7/2016 11:36:01 AM - positioning 0045L3 to file 1
3/7/2016 11:36:05 AM - Error bptm(pid=6064) cannot write image to media id 0045L3, drive index 0, The request was aborted.
3/7/2016 11:36:05 AM - positioned 0045L3; position time: 00:00:04
3/7/2016 11:36:05 AM - begin writing
3/7/2016 11:36:06 AM - Warning bptm(pid=6064) DOWN'ing drive index 0, it has had at least 3 errors in last 12 hour(s)
3/7/2016 11:36:13 AM - end writing; write time: 00:00:08
media write error(84)
3/7/2016 11:36:14 AM - Error bpsched(pid=5848) backup of client 10.174.0.12 exited with status 84 (media write error)
the required storage unit is unavailable(219)