Once every logical block has been written to once, the only available space the drive has to garbage collect with is the over-provisioned space, if it has any of that at all. Without TRIM, any logical block on the SSD that is written to becomes permanently “used” to the drive’s controller, so even if the file whose data is stored within is deleted, the data block still has to be treated internally within the SSD like it’s still in use. TRIM is how the OS says “I’m not using this data anymore, so you can mark it as free,” so getting TRIMmed is a vital component of the SSD’s garbage collection system, not just a nice-to-have feature that magically speeds things up. It is common for a flash block to end up with some pages used and others free, and the drive tries to get ahead of user demand by garbage collecting (consolidating) these partially filled blocks into a smaller number of blocks (that have a lot more data per block), then erasing the newly freed blocks so they’re ready to go if a big burst of disk writes comes in. 4KB) but can only be erased in “blocks” (a set of many pages, i.e. Flash memory doesn’t work like a normal disk it can be written in “pages” (small, i.e. Without TRIM, the drive can’t clean itself up internally because it has to assume that any block which was written is still needed, and depending on the amount of over-provisioning in the drive, you could end up in trouble without TRIM. TRIM tells the SSD that data in a block is no longer needed. TRIM is critical for SSD health over time. I’m sharing this link to the old software to help fellow aging Mac enthusiasts out.ġ0.6 10.6.8 2.2 2006 Apple iMac Mac Mac Mini Mac OS X OS X Snow Leopard TRIM TRIM Enabler Post navigation Then I scanned the Internet Archive’s Wayback Machine and found a working DMG for TRIM Enabler 2.2 in there. I’m upgrading a machine stuck on 10.6.8 and I didn’t want to pay for what was once a 100% free program. There are no other downloads of the old 2.2 version available. However, sometime in 2014, the author of TRIM Enabler made it a paid program and took away the free download for TRIM Enabler 2.2, opting to only make it available if you bought a newer version despite TRIM Enabler 2.2 being totally free to download and use. The tool of choice to do this for several years was called TRIM Enabler, with the last version supporting OS X 10.6 “Snow Leopard” being TRIM Enabler 2.2, the holy grail of flipping the TRIM switch on older OS X versions. What do you do if you’re on an older version of OS X? Well, Apple doesn’t give you trimforce on older versions, so the only answer is to “hack” the storage driver in OS X to bypass the check. There is an exception: in Mac OS X 10.10.4 and later have a command you can run in a terminal called “trimforce” that will enable TRIM support for ALL SSDs, not just Apple SSDs. Third party SSDs never have TRIM enabled. You can get it from the Wayback Machine instead: Download TRIM Enabler 2.2 from The Internet ArchiveĪpple added TRIM support to Mac OS X in Snow Leopard update 10.6.7, but it only works on Apple SSDs. If the TRIM support is disabled, it is not problem to enable it, but it can not be done without third-party utility.Note that no downloads of TRIM Enabler are hosted here. Select About this Mac option.Ĭlick on Serial-ATA option and check the Trim Support information. To check TRIM function in Mac OS X click on Apple logo in upper main menu (top left corner). How to check TRIM support of your SSD drive in Mac OS X and install it to your Mac, OS X will not activate TRIM feature. If you bought SSD from other vendor, like Kingston, Corsair, Crucial etc. The TRIM is enabled only for SSD delivered by Apple. SSDs support TRIM command from 2nd generation. It is supported by Microsoft Windows 7, Windows 8, Apple Mac OS X and Linux operating systems. By doing this, the SSD can avoid slowing down future write operations to those blocks. It is informing the SSD disk that the blocks are no longer used and can be deleted. TRIM is a command that is executed in the background by the operating system when you delete files. To ensure proper operation of SSD drive and its durability, it must be supported by operating system as well as SSD drive. The first generation of SSD drives have problems with reduction of speed after prolonged using and do not support TRIM. Because SSD is completely different technology than conventional hard drives, developers of operating systems must integrate some new management features for these data mediums in their products. SSD (solid-state drive) flash data storage devices allows rapid increase of computer speed.
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