Hello Kudesnikkk, It depends on which DAE that you have with your CX4-120.  Here is a link that explains about the different DAE’s [URL] Please let us know if you have any other questions.
Hello!I have an EMC CX4-120 with an array for 15 FC drives. Only 10 disks of 450GB are installed.Can I install 5 SATA disks of 2TB each (EMC CX-SA07-020) in 5 vacant places?How to connect SATA disks to an FC connector? Thanks in advance! PS: Sorry for my English! 
EMC CX4-120 and SATA