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MacOS High Sierra (10.13): Trim working?
- Thread starter sumo.do
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Trim is now working it latest beta for my Crucial M4 SSD. Did not have to run trimforce or anything.
Hi, I have an iMac 27" late 2009 with Samsung SSD 840 Series running latest beta of High Sierra. Should I turn on TRIM or leave it off? I don't want to f*ck it up
I've got Samsung 840 Pros in three seperate Mac minis and have run them with the trim command and previously with trim enabler for years. No issues.Hi, I have an iMac 27" late 2009 with Samsung SSD 840 Series running latest beta of High Sierra. Should I turn on TRIM or leave it off? I don't want to f*ck it up
You are fine, I honestly don't know what trim does or doesn't. It's not noticeable when on, its a switch and it does not cause any harm from my experience. But supposedly it is engineered for SSD. IDK, but I have it on.
Trim impacts write performance on drives with not a a lot of free space by making block reclamation more efficient.
DP7 restores the trim enable for third party SSDs.
DP7 restores the trim enable for third party SSDs.
Thanks again. I probably don't notice a difference because I only use 20% of my SSD.
Its a bot more complex than that. You might only see that 20% of the drive is currently occupied but the drive firmware moves the files around as you write to them, so depending on whats happening, so a small change that you write to a large file could trigger the firmware to copy the entire file to a different part of the SSD. The firmware will continue to do that to even out the wear (hence its called Wear-Levelling) so you can actually have written to the entire drive yet only have 20% thats permanently occupied. Once a location is written to, the firmware doesn't really know when to release it so it appears as used and will not be used again. This causes performance problems as the SSD firmware attempts to copy files to ares that are unused, which gets harder and harder to do, which slows down the user experience.
TRIM is a command that originates from the operating system that tells the SSD firmware that it can definitely mark those cells as being available for reuse, so they get reset immediately and the forward can better calculate its wear leveling process. More current drives do have a "Garbage Collection" routine that infers what must be grab and clears out those cells, but its not completely effective on its own which is why so many of us fuss about having TRIM enabled.
Thanks DocoBob. A schooling for sure and a good one. I appreciate the explanation.
I installed the latest beta on my Mac Pro with a Samsung SSD via PCI, which was converted to APFS by default. I just checked and trim is enabled, as it was before the upgrade.
Hello guys! I've just installed High Sierra on my Mac Mini. So I can't enable TRIM :-( On Sierra I did it with Trim Enabler app. Now it doesn't work. And when I enable it in terminal, Mac starts to load very slow and freezes anytime. Is there any solution?
I'm running a 2011 Macbook Pro and I have a Samsung 840 Pro 512GB SSD. I had trim enabled with Sierra and just installed High Sierra. Trim has stayed on and the installer converted me to the new file system APFS.
It seems to be running fine, but I noticed my bootup and shutdown times are longer. Trim is enabled according to the system settings.
It seems to be running fine, but I noticed my bootup and shutdown times are longer. Trim is enabled according to the system settings.
APFS only supports SSDs at this time. Apple has stated that Fusion drive support will come in a later update to High Sierra. I don’t think it will ever come to HDD.
Did u do "clean installation"?
[doublepost=1506433039][/doublepost]
I have SSD in Mac mini 2014
Ah, very strange then. My trim started working again around Beta 8 I think and I did not have to run Trim enabler or the terminal command.
Is it a factory SSD? If not, what SSD does it have?
That was my understanding, but people in this thread are reporting they can format HDDs
https://forums.macrumors.com/thread...-convert-to-apfs.2069134/page-2#post-25121542
I converted a spinner external drive to APFS. Did it in place with DU and retained the data. I was just messing around, I am not sure I would convert a backup spinner to APFS. I also converted a 256GB USB stick to APFS.
[doublepost=1506462435][/doublepost]It will not convert a HDD boot drive during install, but that can be done by booting into recovery, DU, unmount, Edit, Convert to APFS. I don't recommend it though.
I'm having the same problem. The only difference is that I didn't need to enable trim. My computer started booting awfully slow until I disabled trim from the terminal. I have a HyperX Savage 480Gb on a 2012 MBP.
I get a warning message when I attempt to force enable Trim that I could possibly lose data......is that a real concern or Apple just being cautious?
Apple is being cautious. By now many of us have used that command, myself included, and there have been no reported problems that I know of. All of my family members use it and none of us has ever experienced any issue. We all do have Time Capsules, just in case something does go haywire, so be forewarned.
Thanks for the quick response. I have multiple carbon copy clones and a time machine back-up if there is a mis-hap. Do you feel it appreciably helps the Macs performance? I have a 27inch/Retina-5K/i7/4.2 GHZ with a 1 TB SSD......
Is the terminal command as just as effective as a program like Trim Enabler 4.0?
[doublepost=1518723237][/doublepost]I ran the command trim in terminal on MacOs High Sierra 10.13.3, and don't see the "trim enabled" in the System Report under SATA/SATA Express.........