The maximum USB transfer size for Windows 7 and Server 2008 R2 is 64 kilobytes. You can increase this by downloading a hotfix from Microsoft (link). This update provides an increase in the maximum USB transfer size. This can greatly increase your performance on these computers!
To maximize the transfer, Type Regedit in the Searchbox
Navigate to the following key -
Create a new key called - VVVVPPPP
Under usbstor key, create a new key so the final path would be:
Create a new DWORD value MaximumTransferLength
Double-click the new DWORD value, set Base to Decimal and set Value data to 2097120