Maxtor HD 20 GB squeezed to 10 GB by OEM, how to unsqueeze?

Hi,

A while ago I bought a Maxtor HD, 20 GB. No matter what I tried I couldn't get more as 10 GB out of it.

When I asked Maxtor they replied:

"Some OEMs (eg. Compaq, Dell, etc.) have the option to change the capacity of drives to suit their particular needs. If an OEM has
sold you this drive as a higher capacity drive then you should take it up with them to get it replaced. If they sold it to you as a
smaller drive or in replacement for a smaller drive, then it has the correct capacity and can not be exchanged."

I tried low-level formatting with MaxBlast but it didn't help. Offcourse I would like to have the higher capacity. Does somebody
know a trick?

Thanks in Advance.

Ron