Can the actual hard drive in an "external hard drive" such as a WD Passport be removed and placed in a desktop?

Do they have a standard SATA (or IDE) interface?

What kind of power connection do they have, SATA, Molex, or ?

I am not concerned if they will physically fit in a desktop, only if they use standard connections.  I am mainly wondering if the 
extra circuitry on one goes bad, can you remove the hard drive from the case and use it in a desktop and/or recover data from it on 
the desktop.

Out of curiosity, are these made for low power?  It seems like hard drives take a lot of power (at least my Raptors do) and a USB 
interface would be a little short.

TIA,

D. Kukral 

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