[Crusher138]

Okay, that is a little techno-dense for me!

I have a Mac Pro purchased just before they went small and black. I’ve been updating to the latest OS all along. I have a third party SSD 480GB drive. Are you saying that if I update to Yosemite I might lose that drive? How do I know if my drive uses TRIM?

[Swordmaker]

I have a Mac Pro purchased just before they went small and black. I’ve been updating to the latest OS all along. I have a third party SSD 480GB drive. Are you saying that if I update to Yosemite I might lose that drive? How do I know if my drive uses TRIM?

Ask the manufacturer. . . but Apple added support for third-party SSDs in June or July by adding more functionality in their own drivers that did not have to compromise the security of the whole computer. It took Apple some time to figure out how to do it, but they did. Some Manufacturers finally released drivers as well. . . and those were also included in later updates to OS X.10 Yosemite. Just make sure that when you do upgrade that you upgrade to OS X.10.5 to make sure you have the latest version.

Mac OS X 10.10.4 Supports TRIM for Third-Party SSD Hard Drives
Tuesday June 30, 2015 9:07 pm PDT—MacRumors.com—by Husain Sumra

Earlier today Apple released OS X 10.10.4, an under-the-hood update to OS X that introduced several bug fixes and improvements. One improvement, according to Ars Technica, is support for TRIM for third-party SSD hard drives. We previously covered TRIM likely coming natively to the next version of OS X El Capitan but it appears support has already arrived.