I was reading the plight of customers using OWC's Aura SSDs who are experiencing similar issues. One idea is to install High Sierra without converting your (Crucial) SSD to APFS (leaving it as HFS+). You can do this in Terminal...just Google "Installing High Sierra without converting to APFS" and there are several articles that will give you instructions on how to do this. I do not know if this will guarantee a successful installation of HS, because the nature of the problem has not been disclosed by Apple or any third-party SSD vendors to my knowledge. Another idea is to hold off on updating to High Sierra until either Crucial releases a firmware update, if necessary, or Apple fixes the bug in a future update to High Sierra. If staying with Sierra is your remaining option, I would not worry, as Apple will continue to issue Security Updates for at least another 12 to 18 months, possibly longer. As a matter of fact, Apple just released security updates for El Capitan and Yosemite back on July 19th of this year (macOS Sierra 10.12.6, Security Update 2017-003 El Capitan, and Security Update 2017-003 Yosemite). If it's any consolation, I have a Crucial MX300 in my Late 2011 MacBook Pro and I am waiting on all of this to sort itself out before I attempt to update to High Sierra.
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