Is this USB powered or needs external AC supply?
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.
351721
I have had my pair for some years now, yes, you need ac power, you need to put a drive in it, and the USB and FW ports work excellently. 24/7 ops, outlasts a number of other "portable" and "networked" drives.
1302300
Depends on what devise you have plugged in. A usb stick should work without the power cable, external drives would not.
1111843
There are one cable USB to an -Mini USB ( http://en.wikipedia.org/wiki/USB#MINI ) in the packet. Its Powered by the USB, no need for extra power.
242527
If you want only usb cable, yes. It is not AC powered, though. I use one to supplement an AC powered 4-port USB hub.
2245374
5 volt 2000ma Premium External Power Supply 5.0v 2.0A (2000mA) AC/DC Adapter for USB HUB and 2.5-inch HDD Enclosure
2041229
It is not USB powered, you plug it into a regular power outlet. It does come with a carrying case for easy transport, though. It's larger and heavier than most "portable" drives. Good drive.
1294869
According to tech support today. Only externally powered USB will be guaranteed to work. Many can't be powered from the Toujch
948435
No problem dude! Its powerd by the USB port! You dont have to plug it on the wall
1899940
Does the USB 2.0 port provide enough power for the external HDD? Or should I make sure to use an external HDD that has its own power source?
1692952
Yes you do. This is the one. Generic Premium External Power Supply 5v 1A 2A (1000mA - 2000mA) AC/DC Adapter, Plug Tip: 1.35mm x 3.5mm x 7mm, for USB HUB and 2.5-inch HDD Enclosure
261350
It came with a power supply. I do not remember if it came with a usb cable, it uses a standard usb cable.
1323542
USB powered. So far I am loving it. The convenience of being able to move it from one computer to another is a great benefit.
1154681
Yes, the unit has a AC power adapter since it is not a USB-powered device. We'll have to verify the amperage of each USB port.
1517413
when connected to pc, the USB port gives this unit the power needed to operate, no ac adapter needed. the usb cable will come with 2 connector, it's recommended that both of them are connected given the fact that one of the connector is an extension from the other connector for some extra energy.
221647
mine has a power supply which i leave hooked up. are you talking about a different drive maybe?
1191298
No, no ac aadpater was not included. It uses power from the usb connection but like someone else mentioned, it has a mini dc plug. Personally, I have only used the usb for power. No need for anything else.