I have a Seagate Central 4TB which suddenly stopped working after 26 months (2 months outside warranty period!). Having done research on these now it seems that they have an atrocious failure rate, but back when I bought it I still believed Seagate were reputable.

The unit powers on however the indicator LED would only show orange, and the NIC activity lights were completely dead. I've pulled the internal drive (ST4000DM000) and tested a different known working drive in the enclosure but the same issue persisted, so I believe the enclosure control board may have overheated.

In an attempt to recover the data, I followed the guide found here (https://myanwyn.blogspot.com.au/2014/08 ... -data.html) and connected the Seagate drive with a SATA->USB enclosure.

Using ExtFS for OSX and then also Ubuntu; the drive initially spins up but then makes a brief click (head hitting something?) and is slow to be detected. I can then hear no further spinning activity from it and the partition is not recognised.

Here is a video of the drive being powered on (sound is quiet so you may need to turn the volume up):
https://youtu.be/RFQ-E1OEqdI

The data doesn't have any monetary value but it contains a lot of sentimental photos that I'd like to recover. Could anybody help to diagnose what the issue may be from the above video please?

Heads are dead.

I'm afraid your only way is to toss the drive and move along.
Otherwise, it would need clean room work by a decent pro. These drives are difficult to recover, and have extremely high failure rate on their media as well. You should expect an expensive data recovery quote on this one.
Sorry

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+1

100% the drive has physical issues with heads and/or media

Absolutely nothing you can do yourself

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The "different known working drive" would not have had the "msftdata" partitions. IIUC, these partitions contain the OS for the box.

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Thanks for your help all, not the news I wanted to hear but I half expected it.
Time to invest in a disk mirroring NAS this time around...

And And And ,
Not Using Seagate Anymore ,Please Invest in a Decent Drive From Other Companies

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Amarbir S Dhillon , Chandigarh Data Recovery Labs [India]
Logical,Semi Physical And Physical Data Recovery
Website-> http://www.chandigarhdatarecovery.com