[ale] How to safely remove adhesive paper from hard drive?

[mute wonder]

I'd like to swap two laptop hard drives, but they're both stuck in their
special, uniquely shaped, removable trays with sticky paper.  One is almost
completely wrapped in closely fitted, one-sided sticky paper, but otherwise
removable from the plastic and metal fittings that comprise the tray.  Since
the paper is so tight about the HDD, it may be able to fit into the
other laptop as is.  The other HDD is more problematic, as it's stuck to its
metal tray with a sheet of double-sided sticky paper.

Any ideas how to detach the HDD without damaging it?
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