Does this HDD have an external power source via power adapter or by USB?
161112
Powered by one USB port. Pretty awesome and fast even in USB 2. It's USB 3 cable.
1302300
Depends on what devise you have plugged in. A usb stick should work without the power cable, external drives would not.
2261999
You CAN power it up via the USB Port OR the external Power Adapter. Using the external Power Adapter allows the plugged in( tested or augmenting) hard drive to operate more efficiently, It's another step but worth the small effort. Product support recommend connecting it that way... so that's what I did. If you do likewise you should connect the Power Adapter BEFORE connecting the USB Cable.
926263
The drive came with a USB cable and a power adapter. I already had a WD 3TB HD for my mac. It has worked so well that I decided to get another one. Haven't had any problems with either.
267015
Yes. I had an SSD drive connected to the back of a server's USB 3 port for weeks without issue with no external power adapter.
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
1354445
Yes. I have connected multiple external hard drives to this hub. It is a powered hub and will power drives that are not externally powered themselves (Drives which have only a USB connector and no DC adapter input).
389751
Power is provided internally via sata connection or you need an external enclosure if not installing internal drive.
1255034
It appears to work powered by the AC adapter or the USB 3.0 cable alone. My USB 3.0 external hard drive works without the AC adapter. However in order to charge attached devices like my mobile phone, the AC adapter has to be plugged in.
636387
The unit does have an external power supply. Unit works well, no complaints here.
860451
There is a AC Adapter included, and since this is built for a 3.5 drive, will require a power adapter, though the nice thing is that it's included.
92192
Drive is powered by the computer (device) it is attached to. There is not external power or plug to attach one.
206049
It has and requires an external power supply. I purchased this particular external drive because I needed an external drive that had its own power supply to get files off of an old laptop computer that only had USB 1.0 ports. USB 1.0 ports are old technology do not provide enough power to an external drive. It was by far the easiest way way to recover and save those files to use this self-powered external drive. There were other ways, but this was a simple solution for me. Moral of the story is that a separate power supply is not always a detriment.
413562
Yes, this box comes with an external power supply. It's a brick-type, similar to what would come with a laptop.
320810
An adapter is not supplied. I have no problem with the 3.0 USB connection. External power adapter port is available. Very happy with this drive.
189285
Mine came with a power brick, for what it's worth. I believe that this hub corrupted my external usb 3.0 hdd, and pretty much killed it. Don't know this for a fact but I don't use it anymore.
221647
mine has a power supply which i leave hooked up. are you talking about a different drive maybe?