the citywest pvr’s have a usb port can i connect a portable usb hard-drive to it to increase the pvr’s current storage?

Short answer is “no”

don’t think any cable companies or phone companies pvr’s allow you to use the usb port, most disable them

shaw’s do, i think its both usb and or esata, HOWEVER once you disconnect it and re-connect it, it formats it and you loose all your storage and start all over again.