altsblock.fs_interleave = sblock.fs_interleave;
altsblock.fs_npsect = sblock.fs_npsect;
altsblock.fs_nrpos = sblock.fs_nrpos;
altsblock.fs_interleave = sblock.fs_interleave;
altsblock.fs_npsect = sblock.fs_npsect;
altsblock.fs_nrpos = sblock.fs_nrpos;