Continuous Disk Activity

Purchased a new My Book Essential several weeks ago. When connected the drive has continuous disk activity. The light on the front blinks constantly. Running 10.8.1 with a new 15" MBPro. The disk is partitioned into 3 volumes. 2 are encrypted using Mountain Lion’s encryption.

Any advice would be greatly appreciated. I’m afraid that the disk will fail more quickly than another vendor’s drive since it is constantly churning.

Firmware is updated also.