Direct Hot Swap Drive replacement accessory for the HP D1166A except Lower Power, new manufacture (not old stock). This 18.4GB 10,000RPM Low Profile (1") Hot Swap Drive has a 4MB Cache and a Ultra160, Ultra3 and Ultra2 interface compatable with all HP Netservers with low profile hot swap shelves. Formatted Capacity: 18.4GB Interface Type: 80-pin Ultra 3 and Ultra 160 SCSI Formatted Internal Transfer Rate (Min.): 26.7MB/sec Formatted Internal Transfer Rate (Max.): 40.2MB/sec External I/O Transfer Rate (Max.): 160MB/sec Average Seek Time Read: 5.2ms typical Default Buffer: 4MB Spindle Speed: 10033 RPM MTBF: 1,200,000 hours S.M.A.R.T. Support: Yes Warranty: 90 days The 18GB 10,000 RPM Drive is no longer in manufacture. Prices are rising! 15,000RPM Option, uses only 9 watts, half of the original! Availability: Usually ships in 3-4 business days. P1166Ao$289.00 Options: None15,000RPM(+$133)