USB3 Speeds mac mini 2013 and Hitachi Tuoro 4TB

I am new to USB3 and have always used FW800 before , I just got a new Mac Mini and an Hitachi Tuoro 4TB I am finding the read/Write Speed with Backmagic Disk Speed Test are really slow.! my old FW800 drive is faster .
anyone have any idea on this?
Write 64 Read 64 Hitachi Tuoro 4TB
Write 81 Read 83 Iomega 1TB FW800 (bus powered)

FireWire is more efficient than USB so even though USB3 is theoretically much faster than FireWire 800 a lot of that advantage is lost. However I would not have expected the results you see.
I would also normally have expected a 4TB drive to be faster than a 1TB drive being that a 4TB is likely to use newer faster technology.
You could check the formatting of the 4TB drive, for use on a Mac it should be partitioned using GUID and formatted using HFS+ Journalled. If it is MBR and FAT32 this will not help.
Also, if you have USB2 devices plugged in as well and this could include the mouse and keyboard they maybe slowing down the USB3 device. If you connect them to different sockets on the Mac mini then this should prevent this.
You might want to read http://www.macworld.com/article/2039427/how-fast-is-usb-3-0-really-.html
Also http://support.apple.com/kb/ht5172?viewlocale=de_de

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