Works perfectly...no need for TRIM..
...Apple officially doesn't support TRIM on these drives, and I don't believe that they have Sandforce or similiar hardware based management. Basically, this means the drive will not last as long as it should, since writes will occur on the same sectors repeatedly for erases and rewrites.
My suggestion would be to give TRIM enabler a shot, though I don't know if it's been updated for ML or not.
http://www.groths.org/?page_id=322
I have a Crucial M4 512GB and Mountain Lion and they are great together.
Crucial sate on their website that TRIM isn't required on these drives as they have their own inbuilt garbage collection system. After 4 months of using this drive (without TRIM) in an MBP there haven't been any issues whatsoever.
SandForce's strength is the ability to compress data before it gets into the flash memory. This peculiarity helps solve several problems at once: first of all, increase the performance and prolong the drive's resource. However, it only works well until the data stored on the drive are compressible. Otherwise, the advantages of SandForce controllers become not so obvious anymore.
However, SSDs based on Marvell 88SS9174 do not depend on the type of data saved onto the drive. They demonstrate constant stable performance with compressible files as well as with incompressible photographs, videos and audio content. Moreover, Marvell 88SS9174 is capable of fighting the SSD performance degradation very effectively, so that it improves almost to its fresh level not only after the TRIM command, but even without it by simply performing idle garbage collection.
Therefore, solid state drives with a Marvell controller inside are a much better fit for RAID arrays or systems that do not support TRIM. As for all other cases, the choice between Marvell or SandForce based SSD should depend on the preferred usage model. SandForce devices will work faster in everyday tasks dealing with well-compressible data, while Marvell devices will deliver higher performance with incompressible data and in case of dominating random requests at a deep queue, which is more typical of servers.
- For the fastest speeds out of the box, don't enable TRIM for the M4.
- The jury is still out on whether leaving TRIM disabled will cause the M4's performance to degrade substantially over time (more so than that which is unavoidable with current SSDs).
- There's no conclusive evidence that enabling TRIM is detrimental to the M4 at this time.
Even if you never enable TRIM the worst that will ever happen is your write speeds and write speeds only may slow down. If that happens, just install the TRIM hack, boot to single user mode, then run the command "fsck -ffy" (without the quotes) and all free space on the drive will be TRIMed and the drive will be back to like new performance.
From the Crucial Website
Recently we’ve received multiple calls about the TRIM feature and how it relates to Crucial SSDs. In a nutshell, TRIM is a feature that helps increase the efficiency of your SSD by preparing data blocks for reuse. Here’s how it works.
TRIM and Data Blocks
On hard drives and SSDs, data is stored in blocks (“data blocks”). Each data block has data from more than one file, and on a hard drive the blocks can be split whenever necessary. When you delete a file in your operating system, for example, the hard drive deletes only that specific file’s information from the data block, leaving the rest in place. When a file is deleted in the computer’s file system, the data stays on the block until the next time that block is needed. At that point the drive swiftly deletes that particular piece of data from that part of the block, and writes the new file there. Essentially, hard drives are able to delete information from part of a data block – they don’t have to delete the whole thing.
In contrast, SSDs have to delete an entire data block before they’re able to reuse it. As such, when an SSD is trying to clear a data block, it puts a copy of everything on the block into a cache (“holding place”) and makes the necessary changes there. The SSD then deletes all of the data on the original block and writes the new data that it was trying to write in the first place.
Understandably, going through all these steps takes a lot longer than it would have taken to simply write data to an empty block. Since the SSD knows this, it simply locates an empty block and writes there. This works great – as long as empty blocks are still available on the drive. When all of the blocks are filled up, the SSD has no choice but to start deleting blocks and reusing them, resulting in a drop in write speeds. This problem, however, can be overcome with TRIM – a feature that prompts the SSD to clear previously used data blocks. With TRIM, the next time an SSD’s filing system wants to write to those blocks, they are already empty and ready for use.
Crucial SSDs and TRIM/Garbage Collection
Since not all operating systems support TRIM, Crucial SSDs have a special feature called Active Garbage Collection. Active Garbage Collection is a process that helps an SSD maintain optimal performance by freeing up memory sectors that are no longer in use. Garbage collection is part of the SSD itself and thus not dependent on your computer’s operating system. Since garbage collection is part of the SSD’s firmware, it works regardless of which operating and filing systems your computer is using.
Note: Garbage collection only works when your Crucial SSD is idle, so make sure to configure your system so it doesn’t go to sleep when it’s idling. Garbage Collection takes time to do its job, but as long as it gets time to idle every now and then, your Crucial SSD will maintain its high level of performance over time.
Again, not using TRIM will in no way harm the drive. You can always enable it later if you feel you need it.
Source - Google-Fu, various MacRumors posters and real-world experience of Sandforce and Marvell
