I came across my big box of Disk ][ cards, and a large set of Mastery Development Teacher/Slave cards today.
Is there an easy way to identify if the Disk ][ cards are 16-sector? I certainly do not recall how, other than the '16' decal that was on the later-model cards.
I'm unsure what I will do with the MD cards. I certainly have enough to make a serial network in here, but I have no practical application for that as no-one else is here to use it.