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Welcome!What Hardware version is your router? Look at sticker under router.
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Firmware version is currently loaded? Found on routers web page under status.
What region are you located?
What version of share port are you using? I use v4 from the DIR-835 web site.
What brand is the 3Tb drive? Do you know if he has any proprietary formatting? Has it been formatted with the Mfr formatting or windows formatting?
When you connected the USB drive to the router, try to power off the router, connect the 3Tb drive, then power on and then test. Is the drive being seeing under Advanced/Storage at all?
FYI,
The only size DLink supports is 500Mb officially. My WD My BOOK 2Tb (2008) USB drive is recognized ok on windows, however on Mac it fails. I had called DLink about the Mac failure and were surprised 2Tb was even being seen at all and it shouldn't be recognized or supported. I told them that the 2Tb drive was working and being recognized on my DIR-857, 825, 657 and 655 using Shareport v4 for both Windows and Mac. They said they would look into and and see.
Give Shareport v4 a test if you haven't already, if it doesn't work, I would recommend that you maybe look into using a USB to LAN adapter solution instead of using the USB port on the router.
Let us know...