=item B<--blocksize=512>

=item B<--blocksize=4096>

=item B<--blocksize>

This parameter sets the sector size of the disk image.  It affects all
explicitly added subsequent disks after this parameter.  Using
I<--blocksize> with no argument switches the disk sector size to the
default value which is usually 512 bytes.  See also
L<guestfs(3)/guestfs_add_drive_opts>.
