ssd update für macbook pro
How to upgrade MACbook Pro 2017 to new SSD of at least 512GB
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Get an external SSD (or regular) hard drive and move all of your space hogging files (videos, photos, etc) to the external drive. You need to maintain a minimum of 10 - 15 GB of empty space at all times (in the case of the Catalina installer you actually needed more because, in addition to the 8+ GB installer, it needed 20 GB to expand and install).
