With 4k advanced format drives becoming more and more popular, it is important that users understand the differences that the move from a 512 to 4k sector size brings about.
During this transitional phase, the majority of larger drives are using 4k sectors internally, but exposing a 512 byte section externally for compatibility reasons.
See for yourself using fdisk. Below is the output of a Samsung HD204UI 2 TB drive:
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