Trim then works in conjunction with the SSD’s garbage collection process to move both valid and invalid data from the old block to the new block. When you delete a file from your computer, Trim notifies the SSD that the location of the deleted file no longer contains valid data. “Trim is an operating system-based command for SSDs that is activated when you delete a file on the SSD. Apple added Trim support in 10.6.8, however Apple does not natively support Trim on non-Apple SSDs. Microsoft Windows began to natively support the Trim command for SSDs in Windows 7. “…Support for Trim is based on the operating system and the SSD manufacturer. If you use a 3rd-party drive, you have to use 3rd-party software to get the performance you need from the SSD. The difficulty is that Apple only supports Trim on its own SSD drives. This process is handled by Trim software. Further, the OS needs to know what parts of the SSD are available to store new data. In order for an SSD system to work properly, the operating system needs to “clean” the unused contents of an SSD drive whenever you add or delete media. NOTE: Listen to his complete interview here. The issue revolves around Trim utility software used by the SSD drive. And, in some cases, the system won’t boot at all resulting in a gray startup screen. Last week, on the Digital Production Buzz, OWC CEO Larry O’Connor discussed a critical problem where computers containing a 3rd-party SSD drive are unable to work properly under Yosemite. If you own an Apple SSD or Fusion drive, this article does NOT apply to you. If you own a 3rd-party SSD (Solid State Drive) unit and are running a version of OS X 10.10.3 or earlier (Yosemite) – you NEED to read this. If you have a relatively recent SSD, though, there shouldn’t be any problem enabling TRIM via trimforce-especially considering that same SSD in Windows or most current Linux distributions would already be using TRIM.” “The scary warnings about trimforce are likely in place because not every disk implements TRIM in the same way, and older SSDs might behave oddly or in ways that OS X doesn’t expect when told to TRIM pages. It’s by no means a requirement, but it’s helpful and could potentially help the performance of an SSD as it ages. “TRIM helps SSDs out by telling SSDs which pages can be marked as stale when an operating system deletes files (something the SSD ordinarily would have no way of knowing). Called trimforce, the utility can be executed from the OS X terminal, and it requires a reboot to start working.” As reported by Ars Technica and confirmed by Apple, today’s OS X 10.10.4 update “has added a command line utility that can be used to enable TRIM on third-party SSDs without having to download and install anything. If I DO need Trim Enabler, do I install it and flip the switch(es) here in 10.6.8 before I do the Yosemite upgrade? I have searched around for step-by-step but can't find them anywhere, which seems a bit odd. Do I need Trim Enabler for my SSHD before I go to Yosemite? I have reinstalled my OS off the install disc and used the old Software Updater to get it to OS X 10.6.8. ![]() for the kext signing security settings, does an SSHD function like a SSD or and HDD?) Will I have problems with Yosemite and its new kext signing security settings on my SSHD? (i.e. I know that functions mostly like a HDD and the solid state part basically runs like a huge cache. ![]() I am willing to purchase and run Cindori's Trim Enabler, if necessary, but as far as I can tell, everyone that is talking about this problem is referring to SSDs, and i cannot find mention of SSHDs anywhere in any of the articles or forums discussing the issue. Drive replacement went well, and I am glad I read about the problems Yosemite has with third party SSDs before I did the upgrade to Yosemite. I am decently fluent with computer stuff but this is my first hard drive replacement and my first deep dive into the world of Solid State drives and SSHDs. My hard drive on my 2011 iMac bit the dust and I am replacing it with a SSHD.
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