<P> The newest members of the IBM Ultrastar family of disk drives provide excellent reliability and performance for servers. Migration to the 9LZX and 18ZX drives is simplified by the use of magnetoresistive extended (MRX) advanced head technology, No-ID sector formatting, a powerful custom controller with hardware assist functions, a proven PRML data channel, and the field-proven design, electronics, and mechanics of previous generations of the award-winning Ultrastar family. </P>