![]() Copy and paste the code into the terminal window, a successful or uneventful response is a new blank terminal line. You will be prompted to enter in your system password when using the “sudo” command, since you are modifying system files. The first step makes a backup of the original IOAHCIBlockStorage file called IOAHCIBlockStorage.original. To launch a terminal window, open the Utilities folder inside the Applications folder and select terminal. The guide breaks the process down into three steps, all performed via copying and pasting the code snippets through the terminal window. Using this guide, we enabled TRIM on the OWC Aura Express Pro 6G 240GB SSD we previously reviewed. Note that if you update the system software, you will need to reapply this patch to enable TRIM again. Our guide is based off the instructions digital_dreamer published on the insanelymac forums this summer when Lion was released and later revised by Grant Pannell. ![]() This how to guide walks through the process of enabling TRIM support with any SSD in the OS X Lion environment. Thankfully there are a set of terminal commands that may be copied and pasted over to turn TRIM support on for any SSD in the OS X Lion operating system. In fact, Lion offers no simple switch to press to enable TRIM. If you switch to a non-Apple SSD or upgrade your hard drive to an SSD, TRIM support does not get enabled by default. Generally, the SSD TRIM command is enabled by default on MacBooks.Apple enabled TRIM support in OS X Lion 10.7 but there’s a catch Apple only allows TRIM to work when using an Apple sanctioned SSD. So to optimize the storage space and extend longevity, SSD TRIM command and Active Garbage Collection work with wear leveling, an algorithm that ensures that each cell is written to and deleted from about the same number of times as all the other cells. If data is written and erased from the same cells all the time, those cells will lose integrity. On the other hand, TRIM also helps prolong the life of SSDs. And this is also the reason why SSDs have a faster speed of read-write when talking about SSD vs. It takes slightly more time to do than just writing the new information, so using TRIM Command can speed up the write performance of the drive. Thus, when writing the new information to that sector, the drive needs to erase the existing information first. If there is no SSD TRIM command on your solid-state drive, then your SSD would not know which sectors in the drive contained useless information. The next time when the computer is idle, Active Garbage Collection will delete the data. Then The SSD TRIM command tells the drive that the data can be erased. When you delete a document on your SSD, the area of the SSD that contains the deleting data is marked as no longer used. Usually, the SSD TRIM command works with Active Garbage Collection to clean up and organize your solid-state drive. For example, SCSI provides the UNMAP command - A full analog of TRIM. SSDs with other different interfaces also have a similar command like TRIM. ![]() In addition to the ATA interface, TRIM is also available for SSDs that support the SATA interface. SSD TRIM, known as an Advanced Technology Attachment (ATA) command, tells an SSD which data blocks it can erase with the help of the operating system since they are no longer in use. ![]() Keep reading to find the answer to your doubts about SSD TRIM and this post also tells you how to enable SSD TRIM on Mac. If you are using an SSD or you want to buy a new SSD, you should know what SSD TRIM is and why it matters for SSDs. ![]()
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