Good Evening.
My name is Alin, and i'm from Romania.
I have a big problem.

I have a friend who recently bought a NetGear NAS for his two 3TB WD30EARX hard drives.
In his loss, he didn't noticed that this NAS only supports 2TB max Harddrives.

And now, this is where i interfere.
I have/had a Seagate ST2000DM001 hard drive for a few months (maybe 1 year), and i just wanted to help him, so i offered my hard drive for one of his 3TB hard drive.
I inserted the Seagate in the NAS and it was recognised ok, all capacity. Then, the NAS automatically started to autoinitialize the hard drive among the other last wd 3TB in raid.

We waited ~1h, and it was just 10% initialized. So, we did a stupid thing. We forced shutdown the NAS.
I took out my Seagate, and conected to the pc, but it doesn't work anymore.

My computer starts, i can see the hard drive in bios, but it doesn't boot from my windows ssd anymore. It's stuck.
I tried the connect the Seagate while in windows, but with no luck.

The only way my windows will see the hard drive, is in disk management when connected through an usb enclosure.
It appears as initialized, with all the capacity unnalocated.
When i tried to initialize, gpt or mbr, the first 3-4 times i got a "Device not ready" error.
After a few connects and disconnects from the usb, i got " Device I/O Error".

I don't know very much, but i think it's bad.
I tried a few programs within Hiren's Boot CD, Ultimate Boot CD, but i got nothing.
I tried to initialize in a Synology Rackstation, but with no luck again.

It was a hdd for games, so i don't want to recover anything. I just want for the hdd to be functional again, because it's high capacity, and it's a bummer to throw it away.
What can i do? What might be broken? The hdd itself as mecanichal, or maybe the PCB Board?
I'm running out of ideeas.

Thank you very much in advanced for having time to read this, and i'm sorry for my typos and mistakes. English is not my native language.

Have you tried Seatools from Seagate website? It may have some option to bring it back to your control.

First step is to establish if the drive has a mechanical failure (probably due to some shock while moving around) or firmware failure, or both.
Though we have seen stranger things before, the drive should not have a firmware failure, unless the NAS unit is programmed to do something we do not know about, which again I doubt.

As HaQue recommended, use the Seagate Tool and/or MHDD (which may be already on the Hirens boot CD) to determine if the drive initializes correctly (full model and capacity). Also, sound description of the mechanical behaviour is helpful as indication of what the failure might be, so paying attention to that is important (ex: spins up, no clicks, does not spin down after 10 seconds or so, etc).

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

Thank you very much for the concern.
I have inserted the hdd back into the NAS, and waited the whole initialization to end. (a couple of hours).
After the initialization, i connected the hard drive on my computer, and started hiren's seagate.

After a format and a wipe, i created a partition, and my lovely seagate is ok .
Thank you very much !