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Good idea. If still sealed in the box it will be worth more to resell too.

I've not heard of them, but I like the case design. Could be handy for something like console backups?

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Really. I would only want brand new drives in a nas.

They won't be the same disk because of how the Red drives are manufactures for extended always on up time specifically for NAS use, but in general I would have guessed sectors would be the same on...

As WD probably manufactured your Hitachi drives they are most likely to be the most similar in terms of sector size and overall formatted storage allocation. If you can't find the information on...

In order to work the drives need to be as big or bigger, correct? If you are unsure regarding 4TB Reds the what about getting a 6TB one?

I suppose the downside of hot swap drives is you lose the 8TB of space the 2 drives provide. It depends how much redundancy you want I suppose.

Storage is never fall proof or 100% safe is it. ...

With Raid 6 you can suffer a maximum of 2 concurrant drive failures and still maintain the integrity of the array. Therefore taking a single disk out of the array would keep it working. As for...

Those drives were most likely actually manufactured my WD as they purchased the Hitachi 3.5" HDD business a long time ago, but have now since sold it on again to Toshiba, hence the reason the drives...

I would definitely swap the disk with a new one if possible as it is slowly signalling failure. I think as long as the replacement drive is the same size it should be fine and just rebuild the set...