USB 3.0 external drive extremely slow on Macbook Air 2014

Dear Apple Support Team & Folks in Apple Community,
Seriously, I have a problem with my new Macbook Air 2014 which has equipped with USB 3.0 port. I read through the forum and hardly find a solution for this.
Recently, I plugged in my USB 3.0 external drive and expect that it would reach the same file transfer speed as that on my PC. Instead of 625 MB/s (5 Gbit/s), it was hardly reaching 60 MB/s (480 Mbit/s) to my surprise! Sounds like Macbook Air doesn't recognize USB 3.0 device properly. I have tried Western Digital and Seagate devices but failed to get reasonable transfer speed on my Macbook Air.
I tried it again with my USB 2.0 external drive on Macbook Air and only got the transfer speed around 15 - 20 MB/s which is disappointing.
Any patches or Firmware updates would be appreciate!
I have OS X 10.9.3 already with EFI and SMC update patched by App Store.

I would be interested to know which consumer grade non-raid external harddisk that could reach 6xx mb/sec.
The speed you mentioned should be normal, since most of these are 5400rpm drives (asumming it is 2.5 inch).

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