Flow rates not good for the usb3

I thought that saturate my USB2 ports with this key (30MB / s) that is not the case .., and usb3 is better in reading but far from what I expected of a key usb3.C ' is its price made me decide ..
If the key is not bad at finishing the locking system seems strong, there is a hole in the plastic to allow a hang strap.

Here are the rates identified with CrystalDiskMark:

On USB3 Port
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CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World [...]
-------------------------------------------------- ---------------------
* MB / s = 1,000,000 byte / s [SATA / 300 = 300 000 000 byte / s]

Sequential Read: 43.164 MB / s
Sequential Write: 17,150 MB / s
512KB Random Read: 41956 MB / s
512KB Random Write: 3.145 MB / s
4KB Random Read (QD = 1): 6.984 MB / s [1705.0 IOPS]
4KB Random Write (QD = 1): 0.019 MB / s [4.6 IOPS]
4KB Random Read (QD = 32): 7.367 MB / s [1798.5 IOPS]
4KB Random Write (QD = 32): 0.020 MB / s [5.0 IOPS]

Test: 1000 MB [H: 81.1% (23.9 / 29.5 GB)] (x5)
Date: 2012/10/26 9:33:39
OS: Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

On USB2 port:

-------------------------------------------------- ---------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World [...]
-------------------------------------------------- ---------------------
* MB / s = 1,000,000 byte / s [SATA / 300 = 300 000 000 byte / s]

Sequential Read: 20 206 MB / s
Sequential Write: 14,069 MB / s
512KB Random Read: 20142 MB / s
512KB Random Write: 3.664 MB / s
4KB Random Read (QD = 1): 4.656 MB / s [1136.6 IOPS]
4KB Random Write (QD = 1): 0.019 MB / s [4.7 IOPS]
4KB Random Read (QD = 32): 4792 MB / s [1169.9 IOPS]
4KB Random Write (QD = 32): 0.019 MB / s [4.5 IOPS]

Test: 1000 MB [I: 65.2% (19.2 / 29.5 GB)] (x5)
Date: 2012/10/22 9:41:29
OS: Windows XP Professional SP3 [5.1 Build 2600] (x86)