"..Drive averaged 1-5% CPU usage hit during backing up. The data rate changed a lot during backup due to the size of files, but as you can see, the Onstream does a very decent job of backing up some large files in a short period of time. Determining data transfer rates would be inaccurate if you took them from those times because remember, the software also has some load times and some seek times to take into account. But overall, you get the picture that this drive is very quick.."