On Wed, 4 Jan 2017, Cory Heisterkamp wrote:
I'm far from an expert, but it certainly looks
like an oxide coating to
me. I'm reminded of the folklore when IBM was developing the RAMAC and
Yes, it is ferric oxide.
Hmm, your drum doesn't look to bad after all. In your case I would clean
all the heads, and the surface with a soft cloth and give it a try. For
basic testing you only need one data track plus the register and timing
tracks.
Christian