[quote="Dave_Bechtel"]>There are many things that I have to learn.

--Not to be rude, but it looks like "BACKUPS" is one of them...

And patience

I simply tried to install old MS-DOS using original MS disks. I didn't expect that 3 small floppies would (?) remove everyting data, partitions, etc.

I have almost forgotten what is MS-DOS.