Originally Posted by unclehonkey
I have a feeling the drive has to be A/C powered and not USB. Maybe someone can confirm that
Electrically, the only reason to have a separate power supply or battery power for USB devices is to minimize ground currents through the USB wires. The more current that flows, the higher any possible offset voltages can be due to wire resistance. Wire resistance would vary due to the gauge and length of the power conductors of the USB cable. Recall Ohm's law: Ground Voltage offset = wire resistance x ground current size. Ground impedance (resistance) would also influence noise levels too.
I do not know if USB signal lines are common mode, or differential--if differential drive, then ground currents then would not matter much at all.
If the USB device required next to no power through the USB power wire lines, then ground currents and offset voltages would be smaller.
A concern that I have about disconnecting the USB from the Homeworx, then attaching it to my PC on a daily or more frequent basis is the wearing and corrosion of the contacts of all USB connectors involved: Homeworx, USB cable, PC USB sockets.
I could not believe the difference that dirt and corrosion make on the contact resistance, especially for RG6 coaxial cable from my cable company or from my OTA antenna. The signal levels can almost vanish sometimes. This is one reason why a periodic visit from the cable service repair man may be good so that he can cut off and replace old connectors mostly due to the center coaxial copper conductor getting too corroded to relay the signal, making any connected equipment less able to receive or transmit (cable modem or digital STB).
Does anyone know if there is a nice / easy / available way to undo then redo the high quality compression fit RG6 coaxial connectors since it is just the center copper line corrosion / dirt that are the primary concern? The cable guy just cuts off and discards such $1 to $4 compression connectors. It would be nice not to have to buy these in 25+ bulk bags and change these every year or two going into every TV set and whatnot--not to mention having to buy the $25 to $40 tool to apply the RG6 coax compression fit connectors.