@Kevin_Z Thanks, I already contacted tech support and it looks OK now. The WD disk is bran new. I was getting many error from robocopy. But I will try a different copy utility. The router seems to be...

I just bought a new archer ax50 and connected my 4tb Ntfs) disk and I get a lot of error when ddoing robocopy to it. Should I retrun this router ? (not impressed) Lionel