I would not suggest tinkering with the data cable for PC, for gaming systems it is different, most of the stuff is Read only. Regarding Greg worry of would would happen if u moved the switched during a session.? First keep in mind by togling the switch you are not togeling the OS. the OS was loaded from drive X and now you have toggled to drive Y. The OS will find that the Hardrive is gone. The Hardrive didnt had enough time to pack up (write back) the critical data , so the chances are that you will end up with a corrupted Hardrive, lost data, or even a damaged drive. That is why those Array Controllers with hot swap drives are quite expensive, but still if one pulls a non faulty drive out in those hi end systems, the system doesnt have time to mark it as faulty , so if one put's it back it may / may not work, a new drive has to be put in to rebuild the data from the parity drive. Well the data is not lost in those systems, systems are not interrupted, but the drive is lost. So make sure u dont toggle the switch when your system is powered on.