[CentOS] USB install annoyances

> But this thread's gotten way OT: *does* anyone have any
> idea what the .img file is that the running o/s from install.img
> is looking for, after the partitioning, when it's ready to install?

Possibly, but without the info I previously requested, I won't be
trying to reproduce the problem.

e.g.
the source file[s] and command[s] used to make your bootable USB stick.