The number of reserved sectors used to be always 1, but this is no longer the case. The FAT volume we format ourselves with mkdosfs no longer follows this age-old convention, which is mentioned in e.g. the classical FAT: General Overview of On-Disk Format specification by Microsoft. So we must read this value from the BPB instead of just blindly making foolish assumptions.
The number of reserved sectors used to be always 1, but this is no longer the case. The FAT volume we format ourselves with
mkdosfsno longer follows this age-old convention, which is mentioned in e.g. the classical FAT: General Overview of On-Disk Format specification by Microsoft. So we must read this value from the BPB instead of just blindly making foolish assumptions.