sorry, my bad.... I have added the seagate desktop to the pool, with the long term aim to remove it from the pool and then use it as another back-up disc. I didn't appreciate that it didn't do anything (blind hope on my part). My personal home laptop keeps saying no space (30mb left on the C:drive) so as its running like a dog I didn't fancy doing chkdsk. Again with the dock, as I haven't used one before, just being overly cautious. I'll clear the log again, as suggested.

Out of interest, the dead drive is still in warranty, so I can send it back to WD for a new one.... not knowing exactly what data is on there as it includes laptop back-ups with personal data etc, do I go with the warranty return or accept the loss and destroy it. What do you think?

I would still attempt to run chkdsk and see what you can salvage from the drive.
Just run it and let it eat for a day.
Unless you don't care what is on it.

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I think in terms of trying to get it to work, its not so much what's on it, as I'm hoping that everything has been duplicated across the pool (the pool wasn't full by any means) but more wanting the getting back to normal being as stress free and straight forward as possible, which I would hope would be the case if it was removed by the wizard rather than just accepting its dead, adding the new red and letting the server try to put itself together, as that seems like it could be hit or miss. (not sure I mentioned it but I also have some file conflict errors).

Update: I have attached the dock to my personal laptop, as suggested, and when trying to run chkdsk on the dead red it shows the drive but says windows can't access it. I've also been able to check the dock works by dropping my previous system drive that I still had about in a box into it.... and it appears and shows what is on the drive (with some clicking and noise) so I'm happy the dock works.

So, even the though the red shows up in properties (and says its healthy), I'm assuming that as it can't be accessed then it has gone the way of the dodo.... or am I doing something wrong?

edit: does the fact that it says it is RAW format (but healthy) have any bearing on not being able to open it??

I had two 4 tb reds go raw on me, could not format them, they had 2 tb of data on them, I sent them in for RMA. didn't care about the data.
When a drive goes raw, it may or may not be able to be formatted, but I don't know if you could do anything else with it and still get data from it.
Sorry
Good Luck

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A raw status on a drive can be a bad thing, or simply that it got corrupted.
If you feel dangerous.
Slip the raw drive in the docking device connected to the pc.
run disk management from the control panel ( administrative tools)
figure out what the location is of the raw drive
disk1 disk 2 etc.
never disk 0
It should show raw to the right of the lower screen panel

run command com(dos)
then type diskpart then press enter
Another dos screen will open
then type select disk (whatever the raw disk location is)
For example: select disk 3 Then press enter again.
You need to make sure you are on the raw disk at this point because the next step will wipe whatever disk you are connected to completely.
then type clean /all Then press enter again.

This will take a very very long time.
it writes zero's to every part of the drive
Leaving it as newer than when you got it.
The only way to figure out the progress status is if your docking port has a disk activity led.
it will stop blinking when complete.

when complete
run disk management from the control panel ( administrative tools) again and look for it in the bottom of the screen.
on the left you will have a red x or something, click on it to initialize it.
It is now ready to format again.
You could try this at this point now, just to see if the drive will format, on the same screen. Just right click on the right side of the screen of that drive location

If you have success then
slip it back in the server and try to add it back to the pool again.

_________________
VGA/PS2 Keyboard/PS2 Mouse/Serial debug board
Popcorn C-200
Popcorn A-200
Dune HD Connect
Rasberry PI OSMC(KODI)
ReadyNAS RN316
Amazon FireStick
Amazon ECHO
AnyDvD
MyMovies