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I have an Intel 320 Series 120 GB solid state drive installed in the optical drive bay of my 2012 MacBook Pro 13". I'm not sure whether to use TRIM Enabler to enable TRIM.

I did enable it before on my 2011 MacBook Pro, but I not sure whether I really needed to. I never had problems with it enabled.

I also doesn’t want to tinker with this, when I’m not entirely sure. Maybe I should use TRIM, but enable it with something other than TRIM Enabler. I don’t know.

I know what TRIM does. And if you buy a Mac with a SSD from Apple, it is enabled by default.

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3 Answers 3

TRIM and Garbage Collection (GC) are not the same, and are both necessary to maintain performance after the drive has been used for a while. GC only takes place in the background when idle, or when the OS needs to write to a previously used block.

TRIM proactively zeros unused areas in the background. This is why you see a slight performance hit, but on an SSD this is negligible and is a lot faster than waiting for GC to work on demand after you've been using the SSD for a while.

Using the TRIM enabler app is not advised, but you can enable it via the terminal by following these steps.


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AFAIK the Intel SSD's have a build-in clean up feature, so if you enable TRIM it 'can' slow you disk down.

Here is an article from OWC: http://blog.macsales.com/11051-to-trim-or-not-to-trim-owc-has-the-answer - which have a simular build-in feature.

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What you really should do is swap the SSD and HDD locations because the connection that the hard drive has is actually faster thus allowing you to give every piece of bandwidth from the SSD to the MLB with the HDD cable. The HDD can't go anywhere near as fast so placing that in the optical drive adapter is a wiser choice all in all, the optical drive cable is just enough that you won't notice any real performance issues in comparison to what the HDD already puts out.

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Not sure if this is correct, but my MBP should have SATA3 on both connection. Also a HDD in the HDD is much more less noise because of the attenuation –  Sebastian Semmler Dec 12 '13 at 11:52
SATA3 for ODD? Not possible. –  Andrew U. Dec 12 '13 at 12:03
But you are right in the regard, the MBP 2011 had this problem, the 2012 does not. What does ODD mean? –  Sebastian Semmler Dec 12 '13 at 12:04
HDD within the HDD bay dropbox.com/s/b8cj1mbmr1cpror/… SSD within the optical bay dropbox.com/s/uphsd2hziofaot4/… –  Sebastian Semmler Dec 12 '13 at 12:08

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