In 2002, Apple also released the Xserve 1U rack mounted server. Originally featuring two G4 chips, the Xserve was unusual for Apple in two ways. It represented an earnest effort to enter the enterprise computer market and it was also relatively cheaper than similar machines released by its competitors. This was due, in no small part, to Apple's use of Fast ATA drives as opposed to the SCSI hard drives used in traditional rack-mounted servers. Apple later released the Xserve RAID, a 14 drive RAID that was, again, cheaper than competing systems.