Slow USB Write - Fast Read

When attempting to write to any USB drive I have connected (including a 1GB USB key and a 1TB Eagle Consus S-ATA Raid0) I initially see the transfer going very quickly as Windows 7 caches the transfer. The speed initially goes to 60MB/s and then the bar stops moving. If I wait, the transfer never completes with a 1GB test file.

I cannot cancel the transfer, since it says Cancelling but never completes. Only a reboot or disconnecting my drive stops the transfer process. While attempting to transfer, any attempt to read from the drive stalls as well.

Read speed is normal. I can access files on the drive, and copy from the USB -> Windows 7 at full speed.

Here are the things I have done to fix the problem:

1) Set the drive to Performance Mode to enable write caching.
2) Uninstalled and re-installed the USB Root Controller and Intel USB Controller devices.
3) Upgraded to the latest Intel Device Drivers.
4) Ensured that my USB ports are 2.0, and that I am connected to the rear powered USB outlets.
5) Installed the Windows 7 hotfix intended for NVIDIA chipsets with 4GB RAM (does not apply to me, but tried anyways).
6) Tried formatting in 16K block sizes instead of 4K or 8K.

When I connect either USB device to my Macbook Pro, with NTFS drivers installed, my read and write speed are normal. For that reason, I know that the problem is not with my USB drives.

Tonite I will try an Ubuntu live CD to see if I can get full speed write with the exact same hardware that Windows 7 is using, to rule out that this is somehow a hardware issue.