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SSD upgrade of mid 2009 MacBook how?

Weaselboy said:
https://blog.algolia.com/when-solid-state-drives-are-not-that-solid/

You are mistaken. This queued TRIM issue was a bug in the Linux kernel and never impacted OS X.
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JTToft said:
- It's not any simpler without it, and the age of the machine, once again, is no concern. Unless you consider it complicated to do the actual 5 second enabling of it. It requires absolutely zero user involvement past those 5 seconds until eternity.
The only thing you achieve by not enabling it is making your SSD gradually degrade over time in especially performance and potentially stability.
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So, if I use TRIM now, will it make my SSD revert back to its original "snappy" state, or does it just keep it from degrading further. I just upgraded from Snow Leopard to El Capitan this week. Yeah, I hate change!
 
I'm not mac expert like you guys.

I just remember this article when doing my upgrade.

I did think mac used some linux kernel that's why thought MIGHT be relavent.

Clearly I am wrong and am happy to listen and update my understanding by those who know (you guys)

I am a newbie after all and want to learn.
 
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-aggie- said:
So, if I use TRIM now, will it make my SSD revert back to its original "snappy" state, or does it just keep it from degrading further. I just upgraded from Snow Leopard to El Capitan this week. Yeah, I hate change!
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No it won't because you will still have unTRIM'd free space since it was not on previously. What you want to do is enable TRIM then command-s boot to single user mode. Then from the command line run "fsck -fy" (without the quotes). That will check the disk and at the end you will see where it TRIMs all unused blocks on the drive. Then reboot. Now you will have restored speeds to like new.

Now with El Capitan you can also do this from recovery with Disk Utility first aid, but the method I gave will work with all OS X versions that support TRIM. Same end result.
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elf69 said:
I'm not mac expert like you guys.

I just remember this article when doing my upgrade.

I did think mac used some linux kernel that's why thought MIGHT be relavent.

Clearly I am wrong and am happy to listen and update my understanding by those who know (you guys)

I am a newbie after all and want to learn.
Click to expand...
No problemo. :)

When this info first came out there was a lot of confusion and many people thought it also applied to OS X, but it doesn't. OS X does not use the same kernel as Linux. The bug involved queued TRIM commands, and OS X does not use queued TRIM commands.
 
elf69 said:
@Weaselboy I turn on trim a good few days AFTER installing my El capitan.

Would you recommend I run as u posted the single user mode?

Would it be any benefit to my macbook?
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You probably have not used the SSD long enough for there to be any slowdown, but on the other hand the command takes about one minute to run and sure does not hurt anything... so yeah, I would just do it anyway.
 
Weaselboy said:
No it won't because you will still have unTRIM'd free space since it was not on previously. What you want to do is enable TRIM then command-s boot to single user mode. Then from the command line run "fsck -fy" (without the quotes). That will check the disk and at the end you will see where it TRIMs all unused blocks on the drive. Then reboot. Now you will have restored speeds to like new.

......
Click to expand...

How would I get TRIM to TRIM used blocks? Or does it matter?
 
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