HP 146GB Ultra 320 15K RPM disk drive with tray 347779-001. HP 146GB Ultra 320 15K RPM hard drives pass a rigorous qualification process, which ensures that every HP drive is proven to perform in your ProLiant server or workstation. Before final certification, all HP hard drives are provided with HP-unique firmware specifically designed to optimize compatibility and functionality, including support of SMART and Insight Manager. These hard drives ship (FREE Ground) Within USA, 3YR Warranty and they come with hot-swappable trays ready to be installed in HP Proliant DL/ML Servers. HP 15,000 rpm Hard Drives provide up to 26 percent better performance over standard 10,000 rpm drives. Actual performance increases will vary depending upon application and configuration. Alternate HP Part Numbers are: 404712-001, 347779-001, BD14688286, BF14684970, BF14686842, BF14687B56, BF14688286, BF14688577, BF14689BC5, BF1468A4B3, BF1468A4BB, BF1468A4CC, BF1468B26B, BF1469A524, BF1468AFEB, 321499-003, 321499-006, 356914-003, 356914-009, 360209-005, 360209-005, 360209-011, 360209-014, 365699-003, 365699-009, 412751-015, 443188-002, 481659-002.