Don't trust your data to those bargain stores old stock, 1999, refurb drives. Buy the best from an Original HP Manufacture producing the level of product quality and service that HP sold to you. e4ServicesInc.com drives undergo the intense qualification process HP required that eliminates data integrity problems, firmware and O/S incompatibilities, and other causes of data corruption or premature failure. Our disks are highly tested, Retail Box, Hot swap Drive assemblies, to add to or directly replace a failed HP P4507A and P4507-69001, except Very Low Power, new manufacture (not old stock). This drive is more reliable than the original. NOT BULK Package, NOT Refurb like others. This 36GB 15,000RPM state-of-the-art design Hot Swap Drive has a 4MB Cache and a Ultra320, Ultra3 and Ultra2 interface and is compatible with HP LP 1000 and 2000. P4507-63001 original Replacement Part Number P4507-69001 original Exchange Part number Formatted Capacity: 36.7GB Interface Type: 80-pin Ultra 3 and Ultra 320 SCSI Formatted Internal Transfer Rate (Min.): 57MB/sec Formatted Internal Transfer Rate (Max.): 86MB/sec External I/O Transfer Rate (Max.): 320MB/sec Average Seek Time Read: 3.6ms typical Default Buffer: 4MB Spindle Speed: 15000 RPM MTBF: 1,200,000 hours S.M.A.R.T. Support: Yes Warranty: 3-year Availability: Usually ships the next business day. P4507Ao$474.90 Options: None72GB_15K(+260)146GB_15K(+732)