Thanks to all!

By "erase" as opposed to "delete", I refer to a utility that
overwrites the disc space occupied by a file using random 1's
and 0's some number of times. The utility we use overwrites 30
times, and the result is considered secure for even classified
material.

"Delete" just removes the referencing/addressing data, but the
file itself remains available until overwritten.

I was/am concerned that a "shadow" copy might sit there after
erasure...