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対象のモデルはA1419 / EMC 2806 / Late 2014 または Mid 2015。 3.3 または 3.5GHz Core i5 または 4.0GHz Core i7 (機種ID iMac15,1)、EMC 2834 late 2015 / 3.3 または 3.5 GHz Core i5 または 4.0 GHz Core i7 (機種ID iMac17,1)のRetina 5Kディスプレイを搭載したすべて。

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What are the software or formatting preparation steps before upgrade?

Hello,

I am going to upgrade my iMac 27” late 2015 fusion drive 2TB(Monterey) to SSD 2,5” 2TB(dont know yet which brand gonna buy) and Samsung 970 evo plus 2TB with adaptor.

I know I may break the system since using adaptor and not original parts but I will give a try! I see many people did the same and after a year their system is doing fine and Samsung/Apple did firmware update for this setup it seems!

Hardware part I have the complete list ready! But software part dont know if other than Bootable usb drive (OS Monetery) need anything els to do? like to I need to format the new drives before install them in the mac and things like that!

There was a complete guide here but I can not find it! If someone has extra or new tips to add plz let me know!

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Do you want to do a frsh install on the new SSD or transfer your existing installation of MacOS?

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Fresh Install! Thanks

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First, install the SSD into the computer. Then follow these steps:

  1. Turn on your Mac, then immediately start holding Command+Option+R.
  2. Keep holding Command+Option+R until you see a globe with the words “Starting Internet Recovery" below.
  3. Connect your Mac to Ethernet or choose your wireless network and enter your password. Click the green check mark to continue.
  4. You should see a globe and a status bar. After the status bar is full, you will be taken to a screen that says “MacOS Utilities”.
  5. Double-Click “Disk Utility”
  6. In Disk Utility, click View>Show All Devices.
  7. Click on your SSD
  8. Chose Format>APFS, and wait for the disk to be formatted.
  9. Exit Disk Utility.
  10. Click “Reinstall MacOS” and follow the on-screen prompts.

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If it's a fresh SSD you will likely need to initialize the drive as well before you can install macOS. Which can be done in Internet recovery by using Disk utility. Just click the drive in question and hit the Erase button - for Monterey it will require it to be formatted to APFS.

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Studio Arash さん、ありがとうございました!
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