4Tb drive showing as 2Tb

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in Techie Stuff
I have a 4Tb desktop HD that is only showing as 2Tb. and am looking for a general direction on how to fix.
The scenario is that I actually have two 4Tb 'data' drives (a WD Green and a WD Red) so I am happy the BIOS and drivers are OK and 4Tb capable as both were working last week.
The 4Tb Red works fine either attached to the motherboard or as an external USB in a 'toaster' device.
The 4Tb Green disappeared from Windows 7 last week and I have lost data but when I tried to reformat it only shows as 2Tb. Have tried both attached to motherboard and also in the toaster but only seen as 2Tb.
Anyone have any tricks/hacks on how I can reformat this disk back to 4Tb?
Thanks
The scenario is that I actually have two 4Tb 'data' drives (a WD Green and a WD Red) so I am happy the BIOS and drivers are OK and 4Tb capable as both were working last week.
The 4Tb Red works fine either attached to the motherboard or as an external USB in a 'toaster' device.
The 4Tb Green disappeared from Windows 7 last week and I have lost data but when I tried to reformat it only shows as 2Tb. Have tried both attached to motherboard and also in the toaster but only seen as 2Tb.
Anyone have any tricks/hacks on how I can reformat this disk back to 4Tb?
Thanks
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Replies
https://www.techpowerup.com/forums/threads/windows-7-and-4tb-hard-drive.202749/#post-3195667
If it was a new build then I would be looking at driver and bios versions but has worked for 12 months.
However, the magic of MSE is that after a few days of frustration with this, one hour after posting its suddenly started to be recognised as a 4Tb drive so ive reformatted it fine - no idea why. Just restoring the data.
Thanks.