That's not correct. The size of the shell is
between a DA and DB, and it
has 19 pins. I have no idea what it would be, but since there's no letter
between A and B (at least the last time I checked my ABCs), and since DC,
DD and DE are taken, I would imagine it's maybe DF or something else
illogically unsequential.
I have seen the 19 pin connector (Mac external disk drive port, ST DMA
port) called a DF19. I have no idea if this is official, though.
Similarly, I've seen the 23 pin version (Amiga video) called a DG23.
-tony