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A trim command (known as TRIM in the ATA command set, and UNMAP in the SCSI command set) allows an operating system to inform a solid-state drive (SSD) which blocks of data are no longer considered in use and can be wiped internally. Trim was introduced soon after SSDs were introduced. Because low-level operation of SSDs differs significantly from hard drives, the typical way in which.

The TRIM command organizes data on an SSD and improves its performance. However, due to the nature of TRIM, data recovery efforts are less likely to be successful. Learn how to check if your SSD is TRIM enabled and about TRIM-SSD data recovery efforts.

It looks like a simple Disk Repair will trim an SSD. I got a new SSD and so I booted from a tertiary drive to clone my old SSD onto my new SSD. After the clone I ran Repair Disk and noticed at the end of the repair it 'trimmed' my SSD. Maybe I just missed this before, but I don't recall seeing this trim.
And you don’t need TRIM for garbage collection to work—but TRIM makes an SSD’s garbage collection more efficient. That being said, if you’re using a Mac, Apple doesn’t support TRIM on third-party SSDs. It was possible to work around this limitation in previous versions of OS X, but you can’t do it in Yosemite without opening up a.

It's quite easy to perform Trim SSD data recovery now. Only two phrases - 1. Check Trim Status; 2. Perform SSD recovery. Follow and get your SSD data back now:

Workable Solutions	Step-by-step Troubleshooting
Phrase 1. Check TRIM Status	On Windows: open Command Prompt and enter fsutil behavior query disable deletenotify On Mac: Open About This Mac > System Report > Hardware > SATA/SATA Express > TRIM...Full steps
Phrase 2. SSD Data Recovery	Step 1. If Trim is disabled, run EaseUS file recovery software; Step 2. Scan SSD drive; Step 3. Preview and restore SSD drive data...Full steps

Can You Recover Data from an SSD with TRIM Enabled

'Hi, just now I inadvertently deleted the wrong folder on my 2014 MacBook Pro running Yosemite, and then emptied the trash bin. I don't have a backup of this folder, so I'm feeling quite helpless. The worst part is that my SSD drive is TRIM-enabled by default. Is there any way for me to recover these files?'

Well, before giving you the answer, it’s important to first understand what the TRIM command is. TRIM command, also known solely as TRIM, allows an operating system to inform a Solid State Drive (SSD) which blocks of data are no longer in use so that they can be wiped to make room for new data.

Normally, when data is deleted from a hard drive, the data is not accessible but it remains on the physical drive. Only once the space needs to be used for other information will the data block be wiped, then rewritten. Via TRIM, the data block is wiped immediately upon deletion. In this way, when the system tries to write new data onto a previously used block, it can do so without waiting. This results in improved performance.

The cost of this improvement in speed is that, on a TRIM-enabled SSD, deleted files can not be recovered. Once you empty the Windows Recycle Bin or Mac Trash Bin, the files are permanently gone.

Check TRIM Status

To see whether TRIM is enabled on your SSD or not, follow these instructions.

On PC: Go to Command Prompt and enter fsutil behavior query disabledeletenotify

If DisableDeleteNotify = 0, trim is enabled.

If DisableDeleteNotify = 1, trim is disabled.

Enable Trim On Mac

On Mac:

Click the Apple logo in the top-left of the screen and go to About This Mac.

Click System Report…

Go to Hardware then SATA/SATA Express, and look for TRIM Support.

TRIM Support: Yes = TRIM is enabled.

SSD TRIM Data Recovery

Although it is definitively impossible to recover data from a TRIM-enabled SSD, you can still attempt to recover using EaseUS Data Recovery Wizard Free (for PC or for Mac). It is often the case that the file names will appear in the software’s scan results, but the file content will not be recoverable. You can try to recover a few files with the free version to see if your data has indeed been wiped or not, at no cost.

The ultimate way to safeguard your files is to regularly back up your data. With TRIM enabled, this practice is incredibly important. EaseUS Todo Backup is a data backup utility that will allow you to restore all files that are lost or inadvertently deleted. Through the program, you can automate backup tasks to run on a time or event basis; such as backing up to an external hard drive each time it is plugged in. I’ll stress again that maintaining data backups is crucial, particularly for TRIM-enabled devices. EaseUS Todo Backup Free (for PC or for Mac) is fully functional and can provide you with all necessary back up features.

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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.

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. 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.

External Ssd Trim

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

Trim Ssd Mac App

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

Trim Support Mac

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

Trim Ssd For Mac