We define a nanodot to be a magnetic sample with a physical edge size
of less than 
m and ``short'' in geometry, i.e.
. Arrays of nanodots are strong candidates for use in patterned
media, as the consistency of shape from one nanodot to the next
promotes predictable behaviour; one nanodot will behave in the same
way to another nanodot, in contrast to irregular grains where clusters
of grains are required to reduce the effects of this irregularity.