Apple's RAID driver has no idea what TRIM is and does not send TRIM to the SSDs in your RAID. Their software RAID driver was last updated in 2009, and OS X didn't get TRIM support until mid-2011. * Does TRIM work with Apple's Software RAID?: No. Apple's FileVault driver sends the "TRIM" command to the disk, and zeroes out all unused blocks. * Does TRIM work with Filevault 2 Full Disk Encryption?: Yes (''). * Do we need TRIM? Does OS X use Queued TRIM? Do Samsung 8*-series SSDs break when TRIM'ing?: "TRIM enabling" is no longer a reason to own the tool.Īs for people's questions about TRIM, GC, etc, I refer to these posts: There are plenty of reasons to use Cindori's Disk Sensei: Disk space visualization, benchmarking, SMART health monitoring, various tweaks to prolong SSD life (like "noatime"). I even suggest using Apple's since they're the ones who created the method, and if any of the implementation details ever change they'll be the first to update their official kext. I'll say it one more time: There is no reason whatsoever to use Cindori's injector instead of Apple's injector they do the *exact* same thing. Moreover, it's very likely that Apple is going to fix it before release so that you don't need to even temporarily disable rootless to run trimforce. Either way, you can easily disable rootless, run trimforce, and re-enable rootless on the current El Capitan beta (instructions for that are in the link above). It's the exact same thing with one small difference: He installs the injector to /Library whereas the trimforce tool installs the injector to /System/Library - and the latter is protected by "rootless" on El Capitan, but that seems like an oversight on Apple's part. kext file that injects the "Force Data Set Management = YES" option in the exact same way as the official extension. The method that Cindori (Disk Sensei/Trim Enabler) is bringing out is *identical* to the "trimforce" command method in my guide. I can already see the confusion growing due to Cindor's intentionally vague statements. My TRIM tutorial has been updated to cover OS X 10.11 El Capitan, OS X 10.10.4+ Yosemite, and OS X 10.10.3 Yosemite all in one place:Ībout Cindori's Disk Sensei and Trim Enabler: ![]() MacRumors forum readers have been testing and discussing the update in our forums and sharing their experiences. Ars Technica points out that running TRIM prompts a "scary" message from the system, but notes it's largely because each SSD implements TRIM in a different way, with older disks sometimes acting in a way OS X would not expect. To enable TRIM, a user just has to type "sudo trimforce enable" into the Terminal window. This means that Mac users looking to install an after-market SSD in a machine originally intended for spinning disc hard drives would run into trouble without the help of other third-party tools. ![]() In the absence of TRIM, users can see significantly slower drive writes as the drive begins to fill up. Most modern operating systems support TRIM but for Apple's OS X, it has only included support for its OEM SSDs. TRIM is a system-level command that allows the operating system and the drive to communicate about which areas of the drive are considered unused and thus ready to be erased and rewritten to. Called trimforce, the utility can be executed from the OS X terminal, and it requires a reboot to start working. With today’s OS X 10.10.4 update, however, Apple has added a command line utility that can be used to enable TRIM on third-party SSDs without having to download and install anything.
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