4 TB drive in docking station only shows as 2 TB...

I've got a Seagate 4 TB drive, that I'm wanting to use in a docking station for backups, but the drive is only showing as 2 TB.
I'm running 64 bit WIndows 7 Ultimate, it's a Seagate ST 4000DM000 drive & a Thermaltake  BlacX docking station.
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Guru JiCommented:
Hi Because the Thermaltake  BlacX docking station supports All 2.5” & 3.5” SATA HDDs up to 2 TB only!

You can try something like this which supports upto 6TB

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