![]() ![]() ![]() ![]() Not as clear cut as the Crucial statement but the bold sentence implies Active Garbage Collection is sufficient. Verify TRIM is enabled Click on the Apple Icon on the top menu bar and then click on About this Mac Click on System Report and check if TRIM support. My most important external USB SSD is a 4TB Crucial X6. Not as clear cut as the Crucial statement but the bold sentences imply Active Garbage Collection is the main tool doing the job. TRIM allows the OS to inform the SSD which data is no longer valid, allowing the SSD to skip over invalid data when performing Garbage Collection". The space in which it resides is simply marked as “free space” that may be used later.īy default, the OS doesn't let the SSD know which data is now free. When the OS “deletes” data, the data does not actually go anywhere. TRIM helps to make Garbage Collection more efficient by preparing invalid data for deletion. "TRIM is a facility by which the OS can notify the SSD when data is either marked for erase or no longer valid. I also have Samsung T5 and T7 and the only statement I can see from Samsung is in their FAQ, where they say: All Crucial SSDs are designed and tested assuming that they will be used without Trim". But if your operating system doesn't support Trim, it's not a disaster. Trim and Active Garbage Collection are useful tools that can benefit the speed, function, and longevity of your SSD. Perhaps you think macOS only issues TRIM commands during startup? If so, why? There are some combinations of operating system and filesystem where TRIM is not used on the fly to mark deleted data as deleted, but as far as I know macOS and HFS/APFS aren't one of them.Ĭlick to expand.My most important external USB SSD is a 4TB Crucial X6. Without TRIM, it's far more likely for the drive to need to pause user I/O requests while it does some GC. TRIM's relationship to GC is that it reduces how much GC a drive needs to run, and makes it more likely that the drive can mostly run GC during idle periods. It's a self-initiated maintenance task required in any SSD which both uses NAND flash memory as its storage and presents itself as a block storage device with blocks smaller than the NAND erase block size. Garbage collection is semantically invisible to every layer above the SSD itself. There's no command macOS can issue to tell a drive "do some GC now". The reason I used scarequotes is that what you wrote doesn't make sense, because SATA and NVMe do not even directly recognize the concept of SSD GC. Users who installed their own SSDs had to hunt down third-party tools that enabled TRIM in an unsupported way.Click to expand.This is the first time I've ever heard anyone claim that macOS only "runs garbage collection" on startup. Historically, Mac OS X has only enabled TRIM for the solid-state drives Apple provides. Windows 7 and newer have had built-in support for TRIM, which they enable for all SSDs. The SSD can then manage its available storage more intelligently. TRIM ensures the physical NAND memory locations containing deleted files are erased before you need to write to them. This causes your SSD to slow down over time unless TRIM is enabled. With flash memory, it’s faster to write to empty memory - to write to full memory, the memory must first be erased and then written to. The SSD knows that the file is deleted and it can erase the file’s data from its flash storage. When an operating system uses TRIM with a solid-state drive, it sends a signal to the SSD every time you delete a file. RELATED: Why Solid-State Drives Slow Down As You Fill Them Up Why TRIM is Important, and Why Macs Don’t Always Enable It by Default ![]()
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