Hi, i only have 254gb (ssd) in my gaming pc and need more storage for movies, music, not active games etc. Also it would be nice to have an external hdd so that i could easily transfer files from pc to pc. My only question is: If i plug a external 7200rpm hardrive into my 3.0 usb header, will it work like an internal and really run at full speed or will the usb header "bottleneck" its speed?