Portable hard drive powering, but not showing up in Disk Utility

I just purchased an ADATA portable hard drive and my MacBook Pro powers it but does not recognize it.  It is brand new and has not been used on any other machine.  Any ideas?
Thanks in advance,
Justin

Some portable drives draw too much power, the Mac might have cut it off or it doesn't have enough power for it.
It might be defective, take it back and buy a quality Hitachi external drive, Western Digital next in quality, preferablly self powered and not a eco-type drive.

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