HP manufacturer's warranty extension for HP LaserJet ProM501 hardware support 5-year NBD on-site service with DMR (Defective Media Retention)* Availability: Mon-Fri, 8 a.m. to 5 p.m. (except bank holidays) * HP Defective Media Retention Service allows you to keep your storage media in the event of repairs to guarantee maximum protection of sensitive data. ***** Important ***** The service contract is only activated upon registration! Please make sure to register your warranty extension promptly using the activation e-mail.