When fulfilling a spare parts order, customers may receive a hard drive that differs from their original. Replacement devices are necessary as older technology products reach the end of their lifespan and are no longer available on the market. The HP HDDQ process involves sophisticated, thorough testing to ensure that the hard drive substitutions are compatible with the customers' systems. Customers can enjoy the assurance that HP has developed and maintained one of the most disciplined and well-structured testing processes in the industry. With superior qualifications and testing, HP is able to offer a three-year pre-failure warranty on HP SCSI hard drives.