D9421ADon't trust your data on just any disk. Our disks are highly tested, Retail Box, Hot swap Drive assemblies, to add to or directly replace a failed HP D9421A Hot Swap Drive. Our drives are Very Low Power, faster, state-of-the-art design, of new manufacture (not old stock, not refurbs, not 90 day units, not bulk packaged like the other sellers). This drive is more reliable than the original. Uses Only 8 watts! This 18.3GB 15,000RPM Low Profile (1") Hot Swap Drive has a 4MB Cache and a Ultra320, Ultra160, Ultra3 and Ultra2 interface compatable with all HP Netservers with low profile hot swap shelves. D9421-63001 original Replacement Part Number D9421-69001 original Exchange Part number Formatted Capacity: 18.35GB Interface Type: 80-pin Ultra320/160/3/2 SCSI Formatted Internal Transfer Rate (Min.): 87MB/sec Formatted Internal Transfer Rate (Max.): 1366MB/sec External I/O Transfer Rate (Max.): 3200MB/sec Average Seek Time Read: 3.2ms typical Default Buffer: 4MB Spindle Speed: 15000 RPM MTBF: 1,200,00 hours S.M.A.R.T. Support: Yes Warranty: 3-year The 18GB 15,000 RPM Drive is no longer in manufacture therefore our inventory of 3 year warranty parts in running low. 36gb drives may be substituted for 18GB. You may consider ordering the 36GB P4620A for the same price, twice the capacity and a 3 yr. warranty. A 36GB can even replace an 18GB in an existing RAID configuration! OR consider the 36GB 15,000RPM drive, 30% Increase in speed! Availability: Usually ships the next business day. D9421A $295.47 Upgrades:: None30DayBulk(-51)36GB_15K(+139)72GB_15K(+450)