Already have MacOSX up and running. Trying to install and dual boot Linux Mint on separate HD. I have tried several guides but when I boot, Chimera does not see Linux HD? Is there a simple guide to this setup?
I suspect you have been selecting the install option from the first screen you see when you select the install icon on the live dvd/usb desktop screen. Follow this procedure and you should have no problems:
Create your Live DVD or Live USB
boot with it
At the desktop select install icon
On the install page select "something else"
Set up your partitions - note: if you already have a default install and are happy with the partitions and sizes, copy that setup when you format your drive again. The partitions and sizes I have here are typical of many linux installations and are not to be taken as set in stone. Make your own decisions as to partition type and size based on your needs and hDD size.
When you have created all of your partitions, there is a selection area below the partitions that says "Device for bootloader installation" and a selection box below it. Default is /dev/sda which you do not want. Click on the selection arrow at the right end of the box and select /dev/sda1 and finish out your install.
When you are done installing, shut down, reconnect your other HDDs, boot to BIOS and make the OS X drive first in HDD boot order, save&exit and continue boot. At the chimera screen, hit a key and see this:
Get used to the popup screen with the "unable to recognize the drive you installed do you want to initialize it, ignore it, etc..." when you boot OS X because OS X can't recognize EXT4 Linux partitions.
BTW, the HDD I was using for this had a previous install of OS X on it so it was formatted GUID.
EDIT: When you format the drive, make the first partition a small HFS+J partition (100-200Mb as an OS X install has) and it will stop the unable to recognize the disk pop-up. (Thanks to RehabMan for the tip)