3 tb not recognised as 3 tb but only as 800Gb

Hello
I installed in an external case a new 3Tb Drive from WD30EURS. It is only recognised as 800Gb.
Do I need to set some jumper? Is it a problem of the external case or the new drive
Regards
Gérard

Launch Disk Utility and check whether there are any special paritions on this new drive that could be holding the extra space.  If not, and you've no data you care about on the drive, try formatting it as HFS+ and see if you recover the space.  You might want to change it to GUID partition scheme at the same time.

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