What does it mean? No external power supply?
332640
This means that there is no cord which you plug into the device and then into the wall. The device will be powered by the computer it is attached to.
332641
It means that you must use an USB port on your computer. I highly recommend this product as it fired right up on all of versions of windows.
1978921
no power supply. BUT the batteries you put in there last for such a long time, I am, actually, very shocked and pleased!
1026130
No additional power supply included because the device is powered thru the USB connection.
97243
I'm sure they mean there is no input port for an external audio source. I too was confused at first.
317345
It receives it's power through the USB only, there are no external power adaptors.
2246866
This motherboard requires an external video source. It has no video output at all.
836252
The item is shipped without a power supply or any info regarding power supply requirements. I would have returned the one I bought, but, due to circumstances, I did not try to install the unit before the return period had expired. Sorry I can't be of more help, but I am stuck too.
1183707
My Case "Did Not" Come With A Power Supply. The Case Is Pretty Cheap for a great case to build a computer in. Hope This helps
333862
No external power source needed. Just simply plug in the 3.0 USB to the PC and you are set. :)
10476
It does not provide power to any device. It is powered but does not provide power (other than through the USB ports)
1650831
I do not use a power supply. If it came with one I would have hooked it up but I don't have a power cord hooked to it and it works fine
2263703
Do you have an adequate power supply for the device? If so then it may be defective.
1041483
No in this case it means that this unit has to be powered by the USB so it's not really portable, sorry.
652782
This needs an external power supply to operate. Lacie also has an external drive that doesn't need an external power supply but it's just for storage only. I have them both.
404143
No need for power. I haven't tried it on any other laptops, just my Leveno.
1661318
It draws power from the pc, so it doesn't need one. Had mine for almost a month and I'm really pleased with it.
1656005
As Frank said "Yes it does require a totally separate power supply"As Tim Said "Steer clear of this item." I also got nothing but erratic readings for voltage and current. Run like the wind and never look! back"