I just bought a brand new Seagate 1TB "Backup Plus" external USB 3.0 drive, and in running some diagnostics, HD Tune is showing a "calibration retry count" warning as shown in this screen grab.

Every other test I've run on the drive seems to indicate that it's fine; a full error scan shows no damaged blocks, etc. I'm frankly a bit out of my depth here; is the HD Tune error something to be concerned about? Is it worth replacing the drive? I'm on a ThinkPad W520 Windows 7 64-bit.
Thanks for any feedback here.