Apple and other computer manufacturers are being taken to task for allegedly exaggerating the real capacity of their hard drives, Reuters reports.

A group of computer owners have filed a class action suit in Los Angeles against a number of manufacturers, including Apple, Dell, Gateway, HP, IBM, Sharp, Sony and Toshiba.

The claims relate to the way manufacturers describe hard drive capacities in their promotional material, where capacity is described in decimal notation, effectively rounding-up the true capacity. For example, a drive described as of 20GB capacity would actually have just 18.6GB capacity.

The group believes these descriptions are deceptive, leaving computer buyers with less storage than they thought they had purchased.

The court is being asked for an injunction against the practice, an order requiring the defendants to disclose their practices to the public, restitution, disgorgement of ill-gotten profits and legal fees.