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block/ioctl.cin Linux kernel source contains misleading comments. BLKPBSZGET (notice the P) gets physical sector size, BLKSSZGET gets logical sector size and BLKBSZGET (or BLKBSZGET_32 inblock/compat_ioctl.c) gets file system allocation unit (cluster) size. Logical and physical sector size differ when Advanced Format 512e is used. (512e @ WP)