Apple Computer has promised to would replace defective iPod nano screens that have cracked after a flurry of complaints.

According to reports in the Wall Street Journal, a "vendor quality problem" caused cracking on a small number of iPod nano screens, said Philip Schiller, Apple's senior vice president of worldwide product marketing. The problem affected "less than one-tenth of 1%" of the nanos shipped, Schiller said.

Affected customers simply need to contact Apple to arrange a free replacement unit.