Before you can use your new SSD with your Mac® system, or install macOS® onto it, you have to initialize and partition it first. Follow the steps in this article if you are using OS X El Capitan or later. If you have not upgraded, follow our guide for earlier versions of OS X.
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3. Type in the name you would like for the new partition and verify that it's set to "GUID Partition Table".
4. Verify that the selected format has defaulted to "Mac OS Extended (Journaled)".
5. Select Erase. The drive will now be partitioned and formatted.
6. When the Disk Utility is done, close it.
The SSD should now be visible on your desktop with the new name you gave it, as well as during the drive selection menu if your run an OS X installer.
If you need assistance with the physical installation of your SSD, we offer guides for installing a replacement SSD here.
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