Mac won't boot? About Yosemite and your third-party SSD<article>
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Reader Richard Spitzer is concerned about using a third-party SSD drive with his Mac running Yosemite. He writes:</p>
I just read an article that Apple is disabling the TRIM function for third-party SSDs in the Yosemite OS update. I have installed third-party SSD drives (in my case Samsung) and until I saw the article was thinking about updating from Mavericks. Should I hold off and what does this mean in the long run?
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Let’s start with some words of explanation.</p><h2>About SSDs and LBA</h2>
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An SSD writes small bits data to “pages,” and multiple pages make up blocks. The SSD uses something called
Logical Block Addressing (LBA) to keep track of which pages and blocks have information on them. This is a kind of map that details which pages and blocks are and aren’t occupied with “good” data. When you delete information from an SSD, that information isn’t really deleted. Rather, a reference to it is removed from the LBA and it’s marked as invalid data. When the drive can’t find any remaining open pages, it looks for the pages that contain invalid data to erase to make room for the fresh stuff.</p><p class="jumpTag"><a href="/article/2849366/mac-wont-boot-about-yosemite-and-your-third-party-ssd.html#jump">To read this article in full or to leave a comment, please click here[/url]</p></section></article>
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Mac won't boot? About Yosemite and your third-party SSD
