<p><strong>Ultrastar DC HC550</strong></p><p><strong>18TB</strong> Provides 29% more capacity than 14TB helium-filled drives</p><p><strong>Ultra-low Watts per Terabyte (W/TB)</strong> 21% lower idle W/TB than 14TB Ultrastar helium-filled drives</p><p><strong>Triple Stage Actuator and Two-Dimensional Magnetic Recording (TDMR) technology</strong> More accurate head positioning, especially in multi-drive environments, for better performance and data integrity</p><p><strong>Rotational Vibration Safeguard (RVS)</strong> Maintains drive performance in high rotational vibration environments and multi-drive systems</p><p><strong>Media Cache Plus architecture</strong> Better random write performance</p><p><strong>512MB cache buffer</strong> Improves response time and data management</p><p><strong>Dual Safe, RSA-signed firmware</strong> Retains previous firmware version for safe firmware updates, verified with an RSA signature</p><p><strong>2.5M hours MTBF and 0.35% AFR</strong> Unsurpassed reliability rating for Capacity Enterprise HDD for fewer failures/less service needs</p><br /><p><strong>Highlights</strong><ul><li> 18TB capacity in a standard 3.5-inch form factor</li><li> CMR technology works with all capacity enterprise applications & environments</li><li> Reliable, field-proven, 6th generation design</li><li> Industry’s first HDD with Energy-Assisted Magnetic Recording technology improves writability and therefore increases areal density</li><li> Industry’s first Triple Stage Actuator enhances head-positioning accuracy, delivering better performance and increased areal density</li><li> HelioSeal design delivers outstanding power efficiency</li><li> 2.5M hours (projected) MTBF rating & 5-year limited warranty</li><li> 512e SATA 6Gb/s</li><li> Legacy Pin 3 config – no power disable support</li><li> Base (SE), no encryption. Sanitize overwrite only</li></ul></p>