I hope this doesnt count as a necro even though I'm just reviving an issue that I thought was fixed/went away. But has returned.
After trying a few times, out of a whim I installed the drive in this thread, Internally, via SATA and it magically worked, had it running fine since Early August!
I've been getting pestered by the dam Windows 10 Upgrade scheduler since Win10 was released, finally caved yesterday and upgraded. Win10 is actually pretty cool, except for the fact that my 3TB Drive has disappeared again.
I tried a setup where I only had my 120GB SSD Boot drive and the 3TB Seagate HDD plugged in, it worked! so I ran a Surface Test from EaseUS Partition Master and it found 14 Bad Sectors by the time it froze/hung at about 56% left it overnight and it didn't budge.
Closed the Test and Rebooted 3TB HDD poofed again. Now I'm back at square 1.
So my new plan is to Clone the HDD so I can work on retrieving the data off a working 3TB drive that I'm going to borrowing from a workmate, surprisingly getting the same model Seagate 3TB.
Now my problem is getting this 3TB HDD browse-able so I can even clone/transfer data.
Running Testdisk right now, while the 3TB is connected via USB (again, drive weirdly works over USB) sadly the one partition I want to save the most shows up RAW in Disk Management. So Using testdisk right now to recover the partition and TD, unlike before(see OP posts), does NOT show any partitions found after I choose "GPT" so I run a "Quick Search" and its going very slowly and I keep seeing "Read Error at **/254/63 (lba=*******)" the
* number keeps changing.
been running for almost an hour:
