Instruction: Answer the given question using the supporting document.

Input:
Question: What is the best 12V AC adaptor to get with this drive?
Document: In other words, do not count on USB suppying enough POWER for this or other portable drives (volts x amps = watts).I ended up buying into the AC adapter systen sold at Radio Shack for $22, with selectable voltage and interchangeable pins, and 1 AMP (important) capacity; you just select the correct "tip" to plug into your particular device (you get one tip free, in my case, the one I needed for G-Tech 12V). Brilliant.
DO NOT BUY THE  SEAGATE WA-18G12U AC power adapter [12V 1.5A ~120-240v US plug] for G-Tech drives! You need a small pin diameter 12V AC converter.This Seagate 12V AC adapter came up when Amazon was searched for an appropriate 12V AC Adapter for the G-Tech Mini 500 Gbyte portable drive. The pin is way TOO LARGE for G-TECH, at least twice too big in diameter.
Like they say, the good thing about standards is that there are so many of them. One would think 12V DC would have just one size, right? WRONG.BTW, my expert at Radio Shack says USB does not have enough AMPS for many portable drives, so you likely in fact need to buy a 12V AC adapter for LaCie, G-Tech etc.
I hear from the Geniuses at th Aple store the G-drive is one of the best things out there, good quality and sturdy... Happy with t so far, thanks and amazon had the best price online among the serious sellers...
I have used this unit for more than 2 years at several locations and it has always performed very well. Finding a vendor who will tell you the drive's speed up front and who delivers high quality through and through is not the easiest task. There are hard drive enclosures that cost more than this particular unit, so even the price is reasonable. If you need a portable drive, this is one of the best on the market.
Just a little humorous.On another note, G-Drives are the best and they are the only drives we use for my video production business.
When using firewire 800 it transfers at a pleasing speed. I portioned my drive one for time machine and the other for all of my photography. I edit my photos from this drive because I get a quicker response in my program. The only issue I have is that 9 out of 10 times when you hit the power switch it will not read it but I just turn it off and on and it always connects the second time. the drive has never disconnected on me while in use.
I'm a recording/mixing engineer and I use this drive everyday. You can run intense sessions directly off the drive, and transfer speed makes large data seem more manageable.Also good for videographers or other professionals dealing w/large file transfers and portability needs.I plan to get a second one to use as a startup disk. Highly recommend this drive.
Also If you do get this drive I advise that you get a Pelican 1020 casePelican 1020-027-100 Micro Case with Clear Lid and Carabineer (Yellow). This case fits the drive as perfect as the packaging that it comes in its crazy there is also room for your wires of choice. With a rugged drive in a extremely rugged case you do not have to worry about breaking it. I highly recommend this drive to anyone who needs a drive.
Very high quality device. A lot of those things that you buy at the big box store don't exactly inspire confidence. This does.Not only does it works seamlessly with my Mac, and Time Machine, but you also get the strong sense that it's going to be there when you need it. That's with these machines are supposed to be for, right?
Answer: I'm using my USB connection to successfully power mine. I have not encountered any issues with this.