If You're Outside The U.s. Or Canada - Plextor PX-610U Manual De Instalación Y Del Usuario

All drives returned to PLEXTOR must be securely packaged and
shipped postage prepaid.
The drive will be returned to the customer at Plextor's expense when
originating within the United States. For a drive originating outside of
the United States, the customer is responsible for shipping costs in both
directions.
NOTE: Warranty validity is limited to that applicable in the location
where the drive was originally purchased.

If You're Outside the U.S. or Canada

Note that the warranty and RMA policy only apply to the United States
and Canada. If you are in South America, contact your dealer or reseller
for all warranty and RMA claims.