does EMC CX support 2.5 inch form factor disks. if support, can 2.5inch and 3.5 inch disks mixed in a emclosure?
EMC does not currently offer 2.5" drives in the CX storage platform. Of course, as with all things, that is subject to change at any time.
On CX4 today, EMC offers the following drives...
3.5" EFD/SSDs from 73-400GB
3.5" 10K FC disks from 300-600GB
3.5" 15K FC disks from 146-600GB
3.5" 7.2K SATA disks from 1-2TB
3.5" 5.4K SATA disks from 1-2TB
As drive technologies change and capacities increase that list changes slightly over time.