This page will show the main function of recovery HD on Mac and how to restore Mac with the help of recovery HD as well as alternative solutions.
Tech Tip: How to Use the Restore Feature of Disk Utility to Clone a Drive
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This disk is locked el capitan
How to reset a MacBook with a locked profile, unknown username, and password - Quora
Wondershare] Solve All Problems with Mac
Official] Sue Wayne
Step-by-Step Tutorial] How to Recover Erased Hard Drive on Mac
Official] Sue Wayne
How to reset MacBook before selling or giving away - 9to5Mac
Restore your Mac - Apple Support (CA)
Wondershare] Solve All Problems with Mac
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The OS X Recovery Partition: What It Is, Why It's There and How to Remove It