Hi;
I ve a MacBook with 256 Go SSD, i want to replace it with a 1 To HDD, Is it possible and what's the part number is?

It depends on the model of macbook. If your MBP uses a 2.5 inch SATA drive, then you can replace it with almost any other 2.5 inch sata. Load up your OS on a usb and install the os.

If your mbp uses a SSD board for HD, then you might be out of luck. The boards come in different sizes depenmding on the year of manufacture (i.e 6 or 12 pin). If you have an ssd board, better just take it to the apple store and let them give you the options

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