I too bought a Seagate Expansion 5T because it is recommended by Tablo. Brand new, and the first place I tried it was with the Tablo It said it was formatting, but no progress. After sending off an email to Tablo support, I became impatient and tried reformatting as suggested in this post. My Windows 8.1 laptop did not find the drive. Downloaded Seagate Paragon, then SeaTools, and the best I could do was eventually find it on Computer Management, but I could not reformat, assign a drive letter, or even delete volume (it did show as one large healthy NTFS partition).
I have read this post carefully, and other than returning the drive, which I cannot do since I purchased it three months ago (got busy with other projects),is there no fix for a Seagate Expansion 5T if you are not fortunate enough to have it format right out of the box?
I appreciate any and all advice you may give me.