Bottom view of RK05 disk platter. This side of the disk looks ok. Damaged side ( 47K) The center of the disk is a conical hole which centers it on the drive spindle. The flat area is where the spindle magnetically clamps to the disk. The ridge around the hub has small slits in it which are the sector marks and the sector 0 mark.
Feel free to contact me, David Gesswein firstname.lastname@example.org
with any questions, comments on the web site, or if you have related equipment,
documentation, software etc. you are willing to part with. I am
interested in anything PDP-8
related, computers, peripherals used with them, DEC or third party, or