HP 146 GB 2.5' Internal Hard Drive. 146GB SAS 15K RPM 6GB 2.5IN DP HDD SASHD. SAS 600 - 15000 rpm - Hot Swappable Drive Interface: SAS Drive Interface Standard: 6Gb/s SAS Rotational Speed: 15000 rpm Drive Width: 2.5" Manufacturer Part Number: 512547-B21