Is it safe to use a 2.5 HD in a 3.5 external enclosure ?

[visitor]

My X31 has stopped working and I need to access files from its HD.
I don't have a 2.5 external case at hand but I do have a few ones for 3.5 HDs and CD drives, and an IDE adaptor for the 2.5 to 3.5 factor.
Has anyone done this without problems?
I wonder if the enclosure's power would feed voltage in excess or other side-effect, since a 2.5 case is usually USB-powered.
Thanks for reading, appreciate any help.

[ErikD]

Since you have the adapter I doubt there would be a problem. After all if you use the adapter in a regular PC it is taking the same voltages that the enclosure would supply and dropping them down to what the 2.5" drive needs.

[qviri]

Actually the 3.5" enclosure (or power plug in a desktop) is providing 12 V and 5 V. The adapter only draws power from the 5 V. It'll work all right, provided you plug the adapter in correctly. (Many will fit the drive both ways, which would send 5 V down data lines, which is a Bad Thing.)

[visitor]

Thanks everyone, I feel more encouraged.

And yes, the adapter originally allowed both sides. When I figured that I stuck and broke a needle inside the wrong slot so the thing was "keyed".