The drive isn't mounted so I cannot access it with Terminal (at least with my level of knowledge). Disk Utility can see this drive, but cannot erase or re-partition it. The backup failed almost immediately, but did manage to erase the HD (or at least the partition is gone). Upon restart, my machine gets the grey screen with the crossed-out circle of death.Īfter figuring out what happened, I then attempted to restore from a Time Machine backup (10.9). P.S I have written this post on the MacBook.I recently upgraded to Yosemite, enabled FileVault and foolishly enabled TRIM (had no idea it wasn't supported). Unless there is a compelling reason, use OS X 10.9 Mavericks and Chameleon/Trim-enable. It is tricky to get the Mac working again if you are not IT savvy. It sees that the kext file has been modified and will not load the driver. Now should you intentionally or accidentally reset the PRAM/NVRAM in OS X 10.10 Yosemite, your Mac will not boot. However in OS X 10.9 Mavericks the kext file only needs to be modified to enable TRIM.
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While it is technically possible to install OS X 10.10 Yosemite on a non Apple SSD, kext signing has to be disabled for TRIM to be enabled. The MacBook now runs significantly faster -not just at bootup, I have not seen a single spinning beach ball. The Sandisk sata interface is negotiating at 3 Gigabit which is maximum interface speed supported by the 2009 MacBook Pro. I decided to downgrade from OS X 10.10 Yosemite to OS X 10.9 Mavericks on the Sandisk Ultra II SSD( a non Apple SSD) and install Chameleon SSD Optimizer to modify the all important Apple kext file.
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It just goes to show that having Apple HDD is not a guarantee of trouble free environment.įor the moment Apple have halted my migration from Windows to OS X and that of HDD to SSD. It is bad enough that I had to downgrade fron SSD to a conventional HDD, but having the SATA interface running at 1.5 Gigabit on an Apple HDD defies belief. With the original 250GB Apple OEM Fujitsu HDD A problem the 240GB SanDisk Ultra II SSD did not have. Reading the Apple forums there have been a number of issues with various SSD drives unable to negotiate a Link Speed of 3 Gigabit on this type of MacBook.
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Then in an attempt to get the SATA interface to negotiate a Link Speed of 3 Gigabit I installed a 500GB Seagate ST95000325AS HDD –without success.įor the short time the 240GB SanDisk Ultra II SSD was in my Old MacBook Pro (13-inch, Mid 2009) 4 GB Mem, with a NVidia MCP79 ACHI it ran very well. Thus having no real choice, I uninstalled the 240GB SanDisk Ultra II SSD and reinstalled the original 250 GB Apple OEM Fujitsu HDD, but noticed the SATA interface running at 1.5 Gigabit. “ĭisabling kext-signing is not a path I want to go down. Currently the only way to enable Trim on non Apple OEM SSD drives running Yosemite is to disable kext-signing.Īs the article says “……It is important to note that disabling the kext-signing to enable Trim is best described as taking a sledgehammer to crack a nut, and for most users it will not be worth it. The information contained on the link is clear as daylight. Not sure how you could have knowledge of this link and tell me to I don’t have to uninstall my SSD. Thank you for the link, and I had already read it.