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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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Can I install an SSD as master keeping the HHD as slave?

I'd like to install my brand new Samsung EVO Pro 850 256GB but at the same time keep the old HHD as slave in order to be used as storehouse.

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SSD installed and OS installed, it's working all fine, thanks.

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There is no such master - slave environment here (Unlike PATA) with SATA.

What you want to do is follow this IFIXIT guide: Installing iMac Intel 27" EMC 2429 Dual Hard Drive Kit to put your SSD in. All of our iMac's are setup as dual drive this way.

Once you get the SSD prepped up with a working OS all you need to do is open the Start Up control panel and alter the setting to the SSD to make it the boot drive - Done!

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Should I upload in a usb drive the OS I downloaded?

Then what? Just turn the iMac on and wait for the 'Start Up Control panel'?

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As your HD is working (correct?) all you'll need to do is download the OS installer from the Apps store onto your HD. Then once you installed the SSD run Disk Utility from your HD to format the SSD and then run the OS installer to install the OS onto your new SSD. At the end of the install process you'll be asked if you have anything to migrate to the new drive. Say Yes and then select the folders you want to copy over in this case the Apps folder.

From what it sounds here you may need some help. You may want to let someone whats done this a few times to help you one on one. Or, drop your system off at an Apple authorized service center and let them do it.

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I don't think I need it, it doesn't seem difficult to do it, I wanted just to know whether I can start my iMac from the new SSD, that's it.

Thanks for your suggestions.

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If both drives are bootable,

Go to Settings --> Start up Disk in OSX.

Here you can select which drive starts up by default.

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The SSD is brand new, how can I know whether is bootable or not.

The question is, should I upload the OS downloaded in a USB and install it into the SSD from there?

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If the SSD is brand new, it is blank. It is not bootable.

You need to create a bootable OS X installer on USB then install the OS X on to the SSD.

https://support.apple.com/en-us/HT201372

You will need to use disk utility to partition and format the new SSD before you can install OS X.

https://discussions.apple.com/docs/DOC-4...

Be very carefull not to erase the hard drive with existing data on it.

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