16d:D11 will be Bay 2A, DAE 8, 3rd disk.  Disks from 0-E will be in bay 1A and the next 15(0F-1D) will be in 2A and so on..  Hope this helps
How to locate a disk, say 16a:c3? Would it be Storage Bay 1A, DAE 5, 4th disk?
Symmetrix disk physical location