2020. 2. 11. 19:40ㆍ카테고리 없음
With the growing popularity and declining cost of solid-state drives (SSDs) for Macs and other personal computers, users have becoming increasingly interested in putting third-party SSDs into their machines. But one issue Mac users have been running into involves support for TRIM, 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. Without TRIM, writes to the drive can see significant slowdowns as the system must read and erase each block on the fly before writing new data. But unfortunately for users looking to install third-party SSDs into their machines, Apple only officially supports TRIM on Apple-branded SSDs. Workarounds such as have naturally been developed to enable TRIM on non-Apple SSDs, but a released earlier this month by Austrian firm Angelbird claims to be the first third-party SSD to support TRIM right out of the box with no need for additional software tweaking. Exactly how Angelbird has achieved native TRIM support on Mac is unclear, as the company has not responded to requests for comment. French site MacBidouille , however, that Angelbird's SSDs appear to simply be masquerading as genuine Apple SSDs, thereby qualifying for native TRIM support.
While the method appears rather questionable and likely to draw Apple's attention, the drive could still be an appealing option for users looking for the easiest possible solution for upgrading to an SSD. OS X Yosemite has added yet another wrinkle for third-party SSD users, as the new kext signing security measure included in the new operating system means that Yosemite systems will refuse to load modified drivers such as those used by TRIM-enabling software. Cindori, the company behind Trim Enabler, is for now recommending that users interested in enabling TRIM on third-party SSDs with Yosemite.
The company acknowledges that turning off this global setting is far from ideal and 'for most users it will not be worth it', but for now it is the only solution. Angelbird has not specified whether its SSDs bypass the Yosemite TRIM issues, but if the drives do indeed simply qualify as Apple SSDs due to the way the model number is presented, it is possible that native TRIM support may still function under Yosemite. Angelbird's SSD wrk lineup is available in three capacities:, and starting at an MSRP of $99.99. Samsung is the best consumer SSD brand and has been for the last 3 years. If you've got the money, go for the 850 Pro otherwise 840 Evo is still better than the other brands.
Don't worry about trim; you can use trim enabler for that and these drives have excellent garbage collection management regardless. While all of that is true, and I'll second the Samsung recommendation (but make sure you get the firmware update for the EVO that was just released!). It pisses me off to no end that Apple doesn't support TRIM on third-party drives. Windows 7/8 universally supports TRIM, Linux universally supports TRIM. Why doesn't OS X? It's like their lack of AHCI support when you're using Bootcamp (or anything that doesn't boot into EFI). There's just no reason for it other than to go out of their way to gimp performance when something is not 100% Apple.
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If I had to guess, it's because Apple is a software company that sells hardware. They are in the businees of making great software and to do that, they have to tightly control the hardware it's run on. Plus they, like a lot of folks, like money. Lots and lots of money.
I think it is the reverse - Apple makes its money on hardware. Apple's pro software apps have been diminished and the reality is that Apple is locking quite a bit down on their own hardware and apps. Microsoft is a software company and wants to run on everything.
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That is why they got huge. Apple is deep into hardware from the get go. I'll spare others the boring history as it is pretty well known. GC is not a replacement for TRIM. Without TRIM, the GC process does not know which blocks are unreferenced by the filesystem and therefore which blocks it can ignore. Without TRIM, on a filesystem with a lot of write activity, the SSD will eventually reach the point where it will always operate at slower write speeds. GC without TRIM can also lower the lifetime of the disk because the GC will repeatedly end up operating on blocks that it would not if TRIM were enabled.
Remember, without TRIM, the disk firmware has to assume that all blocks that have been written to at least once are still in use. Edit: here is a blog post on the subject: http://intelligent.media.seagate.com/2013/05/01/did-you-know-hdds-do-not-have-a-delete-command-that-is-why-ssds-need-trim/.
This is nothing new. Users of SoftRAID has had this option for ANY 3rd pty. SSD since years.
This is native, no software like SoftRAID needed. And SoftRAID can't activate TRIM under Yosemite (precisely for the reasons discussed in the article. When running Yosemite, the SoftRAID application no longer modifies the Apple driver to enable TRIM on non-Apple SSDs. When running Yosemite, modifying this Apple driver can cause your startup volume to longer work.