If not it's failed and you use your warranty.
The 3TB Seagates were known for a high failure rate.
I recently bought a 3TB Seagate Backup+ HDD and i was able to use it the first time and it worked fine filled it with all my work and extra stuff on my computer, now when i plug it in, it is not recognized under Windows Explorer, however I can find it in Device manager and Sorta in Disk Management as a Disk with No information on it. I have tried multiple programs like testdisk, and it could not be found through it. Is there something im doing wrong or any program that can assist me. I would appreciate it if i could get some help. Thanks in Advance