Don'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 A6539A A6539-63001 A6539-69001, Except this 73GB state-of-the-art design Low Profile (1") Hot Swap Drive is 15,000RPM and has a 4MB Cache and a Ultra320, Ultra3 and Ultra2 interface compatable with HP Disk System DS2100 and DS2300. NOT BULK Package, NOT Refurb. Original 10,000 RPM and 146 GB Version available upon requestversion Formatted Capacity: 73.4GB 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 Call for 146 GB Version, it is available upon request Availability: Usually ships the next business day. A6539Aoi$378.47