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I installed a 2nd hard drive in my late 2012 mac mini. This hard disk had Mint Linux - 12 on it (Installed when it was in a different computer). Pressing the Option showed me two additional hard disks one of which successfully booted Mint.

I later decided to install a different (newer) distro and recreated a partition table. I installed the new distro from the flash drive (worked out of the box). Now , pressing the option key does not show the 2nd drive at all. Although once I am booted into the Mac OS X, I can see the partitions and the disk in the Disk utilities.

What do I have to do to see the 2nd disk in the list that shows up on pressing Option at boot time?

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I managed to format the disk again after quite some trial - error to get back my disk options. –  Lord Loh. Sep 21 '13 at 17:50
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