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KingdomHeartsFan said:

So if I wanna use a USB thumbdrive for storage, not an external harddrive then I have to use this?

http://www.amazon.com/Power-Enhancer-Female-Charge-Extension/dp/B00NIGO4NM/ref=sr_1_2?ie=UTF8&qid=1458005575&sr=8-2&keywords=usb+y+cable

If you want to use a USB thumbdrive for storage then you don't need a y-cable because it doesn't have moving parts so it doesn't need the extra power.  

The y-cable is only for portable USB drives that have a spinning drive in them (and don't receive power from a wall plug-in).

USB thumbdrives are not recommended by Nintendo though because of limited number of writes of some flash drives.

If you do end up wanting a USB thumbdrive then choose one from a well known brand that has a 5 year warranty because some generic ones are not reliable.