![]() ![]() In a Knowledge Base note, so I won’t repeat all of that, but will highlight the critical parts. A friend’s niece accidentally accepted the option to enable FileVault 2 when upgrading to Yosemite a few evenings ago, and had her machine-needed for a computer-science class the next morning-slow to a crawl. Your computer also has to remain plugged in. It has to complete, and it consumes CPU resources like mad, slowing down your machine and likely firing up the fan to high speed. Warning 2! Once you start the conversion, there’s no stopping it. Keep a copy of the Recovery Key, probably printed out, for emergencies. ![]() Without it, if you lose or forget the account password to all FileVault 2–enabled accounts, your drive is permanently inaccessible. As with Apple’s two-step verification for Apple ID accounts, this Recovery Key is critical to retain. Warning 1! During the setup, OS X creates a Recovery Key for your drive. ![]() (You can encrypt secondary and external drives by Control-clicking a drive’s icon and select Encrypt “Drive Name,” but it doesn’t tie in with login: you set a password for the drive, and have to enter it to mount it.) This comes with a few big flashing red warnings and pieces of advice before you proceed. On a system without FileVault 2 already in place, you need to turn it on, which converts your startup drive from its unencrypted state to fully encrypted. With FileVault 2 enabled, your computer boots into the Recovery volume, prompting you to login with any account that’s been allowed to start up the computer. OS X Recovery, a special disk partition that lets you run Disk Utility from the same drive you may be having trouble with, restore or install OS X via the Internet, restore a Time Machine backup, or browse Safari. ![]()
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