Lenovo IdeaPad Gaming 3 15ARH-334 HDD Replacement

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When you open the laptop you'll be able to see an empty section on the left side, that is where you are gonna put your new HDD. If you bought the laptop new you should have the adapter of the second photo.
If you don't have it you have to buy an adapter but mind the position of the screws so you can mount it correctly

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