Ever thought that your USB storage device was running slower than it should? It seems that the default settings for Windows 7 regarding the maximum transfer size are quite low (64KB in fact). This means your speeds may in fact be lower than what they potentially could be.
To help with this issue, Microsoft has release an update to help users potentially increase their USB storage device transfer speeds. KB2581464 is the knowledge base article and the KB2581464 fix can be downloaded from here. After the fix you can change the maximum transfer size from 64KB all the way up to 2MB with the following directions:
Click on start menu (or press Windows + R keys) and enter regedit
Now navigate for following registry path (Note: VVVV represents device descriptor idVendor in hexadecimal and PPPP represents device descriptor idProduct in hexadecimal): HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\usbstor\VVVVPPPP
Click Edit, point to New, and then click DWORDValue.
Type MaximumTransferLength, and then press Enter.
Click Edit, and then click Modify.
In the Value data box, type a value to specify the maximum transfer size between 65535 (64KB) and 2097120 (2MB)
The hotfix is compatible with Windows 7, Sp1 & Windows 2008 R2 (32 as well as 64 bit operating system).