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. There is an ecosystem of third-party SSD suppliers for Apple products that might feel otherwise, and customers certainly aren't going to be happy with this move.UPDATE. It is important to note that the kext-signing setting is global, if you disable it you should be careful to only install system drivers from sources that you trust.įrom an OEM perspective it makes good sense for Apple to restrict third-party TRIM applications, it forces their customers to only use Apple SSDs. To continue to use Trim Enabler and continue to get Trim for your third party SSD, you first need to disable the kext signing security setting. Since Trim Enabler works by unlocking the Trim driver for 3rd party SSD's, this security setting prevents Trim Enabler to enable Trim on Yosemite. This is a means of enforcing security, but also a way for Apple to control what hardware that third party developers can release OS X support for. If they have been modified, Yosemite will no longer load the driver. Kext signing basically works by checking if all the drivers in the system are unaltered by a third party, or approved by Apple. (A kext is a kernel extension, or a driver, in Mac OS X) In OS X 10.10 (Yosemite), Apple has introduced a new security requirement called kext signing. A summary of the issue from Cindori Software:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |