Sense Key: 0x05 (KEY_ILLEGAL_REQUEST)
Sense Key: 0x03 (KEY_MEDIUM_ERROR)
Your drive isn't very compatible with these disks. It isn't recognizing them properly, and thus is causing problems.
These are Verbatim -R DL? As a general rule, we advise sticking to Verbatim +R DL disks if you need the extra capacity.