Finding the sector size of a partition

Question

I answered this question, assuming that the *.img file had a sector size of 512.

How do I query a device, or the image of a device, to find the correct sector size?

Answer 1

fdisk -l (that's lower L in the parameter) will show you, among other informations, the sector size too.

Answer 2

According to the documentation for the queue sysfs files:

# cat /sys/block/sda/queue/hw_sector_size
512