Does a USB flash drive need the power cables found in a USB extension cable, or does it only need the data cables?

So, I have a project I hope to complete in modifying a tron identity disc.   Here is my hopeful setup: A flash drive is hidden inside the disc with a usb power cord extension going from it to the outside world.  My hope is to have the 5V of power coming from my computer turn on a set of extra LEDs in the disc, while the data can be accessed and transferred.  Does a USB flash drive need the power inputs from a normal USB cord to function?

Comments

[rickharris]

A standard USB lead supplies power.

[Re-design]

And the usb flash drive needs the power to work. Unless the leds draw large amounts of current there is no reason the usb port can't supply both.

[Mr. Retro]

Okay, awesome, that's all I needed! Thanks!