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Model A1225 / Early 2009 / 2.66, 2.93, or 3.06 GHz Core 2 Duo processor

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Rplacing optic drive with SSD (for Dan)

OK we're on a pretty steep learning curve here, Dan.

I just need to check a few things with you before I go further. I didn't look at the Dual Drive instructions initially as I thought that referred to the Hybrid drive mentioned in an earlier post. I've now read it and am happy to continue.

I've checked the Hard drive enclosure at step 22 and intend to order part EU107081 in EU ifixit store or IF107-081-1 in US store (at half EU price!) (I'm in UK).

The Samsung 850 EVO 250Mb 2.5" SSD is available in UK at about £80. It says however that connectivity is at SATAIII 6.0Gb/s, but compatible with SATAII. Is that OK? If you are happy with these choices I shall go ahead and order together with specialist tools listed in guide?

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Your Samsung 850 EVO drive is an AUTO drive so it will work across the different SATA based systems. So you're good here.

If you go with a different drive review the spec sheet to see if it lists SATA II (3.0 Gb/s), if it does then it too will work! If it only lists SATA III (6.0 Gb/s) then it's a FIXED speed drive and won't work in your system.

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Thanks Dan, I'll go with the Samsung 250 EVO as you recommended. Can you tell me, will the iMac know to boot from the new SSD? If not do I need to configure it to do so?

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As you still have your HD in place you'll need to first install the OS onto your SSD using the OS installer from it. Then you'll need to alter the startup disk setting within the system preferences to the OS thats on the SSD and your done!

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Thanks again. I know we are a way off that stage yet but I'd like to feel confident as to what to do and I'm anxious to use your expertise. So after I install the SSD, I restart the iMac and it will boot from the old HD. I think you are saying that I have an OS installer on my current HD. Are there pretty easy directions as to how to install the OS from the old HD to the new SSD? I'm feeling a bit nervous abour this step!

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Here's one of the better guides: How to clean install macOS. Skip over setting up the USB drive as you'll be using your HD instead. Look in your application folder for the OS installer, or go to the App Store and re-download it (El Capitan 10.11.x) from the 'Purchased' listing.

One thing you'll likely need to do here is to manually back wind your date to Feb 2016 as the OS installer might give you an error telling you its corrupted (it's not) "This copy of the Install OS X El Capitan application can't be verified. It may have been corrupted or tampered with during downloading" Apple was sneaky! They put in a date window into the installer if the date is to old or to new it won''t install.

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