Yes, with a couple of clarifications:Phil O wrote:So let me see if I have this straight.HCMarkus wrote:When operating your Mac under any pre-Yosemite OS, kext signing is off. So when you boot from your alternate drive with Trim enabled, you can Trim your SSDs. This communicates to the SSDs which files have been erased (Trim informs SSDs what the OS already knows) so the SSD knows which cells can be erased in advance, saving wear and tear on your SSDs. When you boot back into Yosemite, Trim is off, but the information was previously passed to the SSD when the drive was Trimmed.
1) Install Trim Enabler on my pre-Yosemite drive (it's a spinner with Mavericks).
2) I boot from Mavericks and turn Trim on with Trim Enabler.
3) Run Disk Utility and repair my SSD.
4) Re-boot from my SSD (running Yosemite).
Correct?
A. After step (2) above, you must re-boot to allow Trim to take effect before you take step (3).
B. You won't need to Trim your new drive until you've used it a while. How often you'll need to Trim depends on how much spare area you have and how much erasing you do on the drive. And if you never get around to it, the SSD will still probably work fine. It will run circle around your spinners, especially as a boot drive