If this question has been asked and answered elsewhere, the I apologize, I did search. On my Vista computer, I have a 7-port powered Hub (d-link) connected to 7 different powered USB external drives. These 7 Ext. drives are powered thru a standard power strip. When I turn them all on at once, often times only 4 or maybe 5 of the Ext HDD's will be recognized by the computer. They are all known good drives as I can connect them to another computer I have (Vista) and they work just fine. Now it has been suggested to me that the problem is a powered surge when all of these devices are started simultaneously it overwhelms the computers +5 volt line. This seems unbelievable to me as I would expect a powered Ext HDD connected to a powered USB hub would draw minimal to negligible power from the computer. I also have a bunch of ext. 2.5 inch drives in enclosures which draw all of their power from the powered usb hub and they all work just fine. So what say you, is there any power "spike" that overwhelms the powered hubs and enclosures or is it just the OS craping out when all of these devices come on line at once? Thanks for the feedback.