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One key change is that sector size is now split into two concepts: logical sector size (seen by the OS by default) and physical sector size (visible with extra support in OS and tools). Early Advanced Format drives keep 512 bytes as the logical sector size (termed 512 emulation) with 4 KiB as the physical sector size - but some drives pretend to have a 512 byte physical sector size while actually using 4 KiB internally.

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