Looking for a program.

Hey,
How is everybody doing? Been awhile since I posted life got busy and I just got back from a vacation. Hope all is well.

Okay, I have nothing to go on for this search, but I'm looking for a program like DBAN, but will keep the boot record intact so that I could use older hard drives like a flash drive.

I had an issue moving files while working on a friend's laptop. (Didn't have a thumb drive big enough for the one folder) So I DBAN'd a different HD and was going to move them on to it to transfer them, but it wasn't recognized and I was told my a friend that I needed the boot record.

Are there any programs that do what I am looking for?
Thanks in advance and sorry for it being sporadic I'm still exhausted from my vacation and not forming thoughts right.