Mac Ssd Trim Enabler For Mac

先日MacBook Pro/Mac miniに搭載するSSDの購入とデータのコピーについて以下の2つの記事を書きました。. ↑「Trim Enabler」と言うソフトを利用してTRIM機能をONにしていたのですが、MacOS X Yosemite 10.10.4以降はフリーソフトを使わずにAppleが用意した「trimforce」と言う.

You can also install Cindori's Trim Enabler, available <a href='http://www.groths.org/?p=617'>here</a>.
You'll recognize his name if you've used his utility for flashing non-Apple video card upgrades for Mac Pro towers. Anyway, it simply enables the (obviously) already built-in trim support for almost all SSDs, not just those that are Apple-provided.

You can do the same thing by booting to single user mode (reboot while holding command-s) and entering 'fsck -fy' (without the quotes). If you have the TRIM hack installed, this will TRIM free space on the drive. If the TRIM hack is not installed this will not work.

Of course a ssd from, say OWC, has no need for this. Most of the new SSDs have functions to do garbage collection built into the controller on the drive.
Go look it up on OWCs site.

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Built-in garbage collection is guessing at what needs to be reclaimed. TRIM lets the OS tell the SSD directly 'yes, you can free this now'.
No amount of clever GC algorithms can compare to a simple instruction that says 'do this'.

I bought a Vertex2 SSD drive over 7 months ago. I don't use TRIM.
I ran a speed test on the drive right after the purchase.
I ran the same test on the drive just recently. The results were the same.
No loss of speed. The built-in SandForce controller does a good job iIMHO.

After reading things on the OWC site and on ancillary blogs maintained by their top personnel, I have lost respect for them. One has to be able to differentiate between technical competence and cleverness in self-promotion. 'roothidclass0000'. I for one am not going to pay someone premium prices for their ability to BS.

I have no second SSD to test. Really curious whether third-party add-on does this, or OS X itself.

My guess is it's a result of the 3rd party TRIM enabler - just did Disk Utility --> Repair on my machine (MacBook 2008 w/ Lion + Crucial SSD) and it didn't say it did a TRIM.

Yeah, don't trim OWC SSDs. Decreases performance. http://blog.macsales.com/11051-to-trim-or-not-to-trim-owc-has-the-answer

Isn't it supposed to happen on the fly ?

Why do you have 'Trim Enabler tool/hack installed'?
Lion supports TRIM.
See: System Information->Serial ATA:
TRIM Support: Yes

Lion only enables TRIM for apple-shipping SSDs. Third-party drives will not get it without a hack.

'Cus I'm running 10.6.8. I'm an old fart set in his ways.

This 'trim' ability is built into Lion's Disk Utility and 'fsck', and works on supported (Apple) SSD drives.
Trim Enabler is not needed.

I installed an SSD into my MacBook Pro over 6 months ago. It is a Vertex2 (with SandForce). I ran some tests on the SSD right after installing it.
Then I ran the same exact test just recently, over six months after the purchase. The performance still the same.
And this is without TRIM.
I think these new SSD drives are doing a great job with doing 'housecleaning' on their own.

Yes, newer drives don’t need this. OWC SSDs are the best there is imho. I’m using their 480 GB 3G model. I’m somewhat glad that my older MBP only does SATA2, otherwise I might not have been able to hold myself back ordering the 6G… :-)

The best way to expand your Mac’s lifespan and obtain a significant speed boost is by replacing the hard drive with a solid state drive (SSD). You’ll notice the huge performance improvement right from the first time you boot up and immediately praise yourself for making this investment. However, you shouldn’t stop at installing a new SSD. There is one tiny command line you must type into Terminal to enable a feature meant to expand the lifespan of the newly installed drive; this feature is called TRIM.

What Is TRIM, and Why Do You Need It?

Writing to an SSD is totally different than writing to a traditional hard drive: the SSD first clears existing information from the flash memory cells and programs new data into them; hence, the writing process is often referred as program/erase cycles or P/E cycles. There is one thing to note, though, and that is that there are a limited number of P/E cycles an SSD can support. Writing to an SSD is like writing on a piece of paper with a pencil: if you erase the same space too many times, it can wear out. Manufacturers address this issue with so-called wear leveling, which prevents SSD memory cells (the pages) from wearing out.

SSDs contain memory cells organized into pages and blocks. What represents a challenge is that with an SSD you can write on a page any time, but you can erase only one block at a time. Each block contains a specified number of pages (from 32 to 256), which contain a specified amount of data (2 to 8KB). Unlike traditional hard drives, data on SSDs can’t be directly overwritten. When data changes, it must be written again. The same data (and metadata) ends up being written over and over again in our daily use of computers generating a phenomenon called write amplification, which uses up the limited P/E cycles.

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TRIM can be considered a more efficient way of handling “garbage” and was introduced shortly after SSDs became available. The TRIM command allows the operating system to inform the SSD about regions where the data marked for deletion are stored, and after trimming the SSD won’t preserve the contents of the block when it writes new data to a page. This enables less write amplification and, as it doesn’t use up the precious P/E cycles, the SSD’s lifespan will be much longer.

Back Up Your Mac Before Enabling the TRIM Command

You need to enable trimming manually when installing a third party SSD. All Macs shipped with an SSD have TRIM enabled, however, and yours can be checked by clicking on the Apple logo > About This Mac > System Report > SATA/SATA Express and look for “Trim Support”. Note that this won’t work on Retina MacBook Pro (late 2016) units.

If the answer here is “no” and you are running either macOS El Capitan 10.11.x or macOS Yosemite 10.10.4 or later versions, then TRIM can be enabled with one simple command in Terminal. Earlier versions of macOS don’t support this command, but there are third party apps, such as TRIM Enabler ($14.99), that can enable it.

Before you enable TRIM on the freshly installed SSD, we highly recommend doing a manual backup with Time Machine (or the backup service of your preference). Do not skip this step, because – despite supporting it – Apple doesn’t take any responsibility for data loss during the process. If anything goes wrong, the data will be lost and you won’t be able to recover it, so a backup can save the day.

But you don’t want to fill up your backup drive or the precious space on the SSD with all the junk files generated by apps as you use them: cookies, cache files, duplicates, erroneous downloads, iOS firmware downloads and much more should be wiped. For this reason, we strongly recommend performing a system cleanup using a Mac optimization app such as CleanMyMac, MacBooster or OnyX. After the cleaning process your Mac will be in its best shape for a backup and then to enable TRIM.

How to Enable TRIM on macOS in Five Easy Steps

To expand the lifespan of your SSD, follow the steps below:

1. Launch Terminal.
2. Type the command sudo trimforce enable, and press enter.
3. Type the admin password, and press enter.
4. Read the system notice, type “y”, and press enter.
5. macOS will require your consent to reboot after finishing the process, so type “y” again, and press enter.

After finishing the process your Mac will reboot with TRIM enabled. Check again if TRIM support is now “OK” by clicking on the Apple logo > About this Mac > System Report > SATA/SATA Express, or by typing the following command in terminal:

system_profiler SPSerialATADataType grep ‘TRIM’.

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