Thanks Bert!
I ordered the drive and will wait to change it. If there is a warranty claim I will use that as a spare for the next failure.
Actually, I ordered 3 enterprise SAS drives, the one above and two 2TB SAS drives. My server has 6 bays, and I have been using 4 bays for the raid 10 and 2 bays are blanks. I am planning to remove the failed drive and install all 3 drives.
I am planning to make a raid 1 of the 2 large slow drives for programs and data other than AC and the PM. I'm researching that now, and will ask my IT to ensure it comes off okay.