 TRIM is not automatically enabled for third-party drives, although it can be enabled by using third-party utilities such as "Trim Enabler".The status of TRIM can be checked in the System Information application or in the codice_3 command-line tool.Versions since OS X 10.10.4 (Yosemite) include codice_4 as a Terminal command that enables TRIM on non-Apple SSDs.