I've got the st.conf that was put out on the list (which I will summarize
later), and the drive appears to be fine :) Unfortunately, we are ending
up with a write error rather than an EOM when the backup reaches the end
of media. Any ideas?

Hardware:

IBM LTO drive

st.conf entry:

tape-config-list=
"IBM ULTRIUM-TD1", "IBM Ultrium", "CLASS_3580",
"IBM ULT3580-TD1", "IBM 3580 Ultrium", "CLASS_3580";
CLASS_3580 = 1,0x24,0,0x45863d,2,0x00,0x01,0;

Software:

Netbackup 3.4GA