However, before NAND flash memory cells used in SSDs can be re-used for writing, their contents must be erased, a process which makes writing to them significantly slower. When re-using those blocks for new files only requires that they are rewritten, as on a hard disk, that’s not a problem, as the disk controller can choose to reuse them whenever it wants without any side effects. On any storage medium, the file system normally deletes files by marking their storage blocks as being no longer in use. This isn’t an abbreviation, but refers to the TRIM command, which is central to this issue. Step 1: Check TRIM.With many Mac users switching from hard disk storage to SSDs, and following my recent article about adding a two-SSD external enclosure, I thought it might be useful to look at some commonly-raised issues about SSDs: TRIM, wear levelling, and how they interact (or don’t) with macOS, particularly APFS.
If you aren’t sure, the best thing to do is double-check. If, on the other hand, you later added a third-party SSD to your system, then TRIM will be disabled by default. If you bought a Mac with an SSD installed from the factory, then TRIM is enabled by default and you’re all set-nothing to worry about. For whatever reason, Apple hasn’t allowed you to enable TRIM (one of the best ways to maximize the life of your solid state drive) on third-part SSD drives. As you use your drive, changing and deleting information, the SSD needs to make sure that invalid information is deleted from the drive and that there is.
No matter what name it goes by, Trim works with Active Garbage Collection to clean up and organize your solid state drive. Trim tells your solid state drive which pieces of data can be erased. It was possible to work around this limitation in previous versions of OS X, but you can’t do it in Yosemite without opening up a. That being said, if you’re using a Mac, Apple doesn’t support TRIM on third-party SSDs. And you don’t need TRIM for garbage collection to work-but TRIM makes an SSD’s garbage collection more efficient.
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