The reason I post this because I just bought 2TB Seagate. Unfortunately, it also has the nickname Deathgate . Read the review, you will know what I mean. I test my luck.
Link to the HDD review
I spent 3 days to test the HDD. I have tried Seatools and some other software.

Yes, I know there is freeware out there. I have tried many Hard Disk monitor software. To tell you the true, I have 4 Hard Disk monitor software installed. After all, I just come back to Hard Disk Sentinel because:
1. It's easy to understand.
2. It has a many difference tools to test your computer's hard disks.
3. It has a huge library of HELP. If you don't understand, you can click on the Help button.
Hard Disk Sentinel has 3 versions for home user: Free, Standard, Professional.
-If you want to do a quick test. Free is all you need.
-If you want throughout test. Standard is the man.
-Professional version can remote monitoring over network, send alert using email Or you can even do a backup.
All version support IDE/SATA/SCSI/SAS/USB drives.
More review: link

Hard Disk Sentinel offers 40% off. click here.
The license allows free upgrades to all future versions so there are no additional costs/fees.
The coupon code: HDSP-C5-GA28612