10.10.4 SSD Trim Command

How about disabling?

sudo trimforce disable

Some SSD's don't take well to this, so be careful.

Also, if you don't fill your drive completely, its normal garbage collection should be sufficient.

Also, if you don't fill your drive completely, its normal garbage collection should be sufficient.

It does not work that way. Once all the file system's free space has been used at least once, the SSD thinks there is useful data in the sectors. So there may be lots of free space from deleted files, but the SSD may not know that. TRIM is the file system's way to tell the SSD that a deleted file's storage is available to garbage collection.

Now if the SSD is partitioned, and that extra partition is never written ever, then all of that space is effectively part of the over provisioning and spares giving the SSD more space for garbage collection.

Then again, depending on which SSD is being used, it may already have a sufficient over provisioning with enough spares such that garbage collection keeps up with the typical writes.

It needs free space to move things around and restore the deleted sections. It should have some reserve space to do that, but just like any drive, it needs room to do its job. The garbage collection will take care of the deleted areas if given a chance.

Just be aware of the risks here. Read the warnings, CAREFULLY.

There are drives which can have issues. This can mean losing ALL YOUR DATA on the drive. Never, and I repeat NEVER, do this without having a full and up-to-date backup, and then have a very regular backup plan.

The current risks are with SSD "Queued TRIM" commands, which to date are ONLY done by Linux drivers. Windows and OS X do NOT use Queued TRIM commands. Or at least that is what I learned from the Mac Geek Gab podcast.

I installed a Samsung SSD 850 EVO on my 15 inch mid 2015 MBP and having been so impressed. However I'm concerned about the TRIM issue. Does anyone know where I could find out if its supported well enough, or should I just go buy an OWC drive with TRIM enabled?

I'm possibly chasing my own tail here, I'm having really odd finder issues that I've never seen before [ essentially I can navigate thru my directories via all my apps, but not with the finder, which does not refresh/ respond]...

Thanks :/

There are others that have used the Samsung 850 EVO with TRIM. Apple is NOT going to say anything about 3rd party storage devices. You would either have to take "ad hominem" reports of success, or get Samsung to tell you it is OK.

If you feel TRIM is affecting the Finder, then disable it and see if it still affects the Finder. Also try booting into Safe mode and see if the Finder is still affected (Safe mode is an experiment as it disables 3rd party software additions from starting) <http://support.apple.com/kb/ht1564>

Are you using Yosemite? I only ask because a lot of time people pigging backing on someone else's thread are not always using the same OS, _AND_ because if you are using Mavericks and Google Dirve, there is a known incompatibility between Mavericks, Google Drive and the Finder.