Dell p/n RY491 / TN937 / OR Equivalent, you will get a matched set of drives per qty 4

146GB 15K 3.5″ SAS Hard Drive with Tray
Seagate Cheetah 15K.5 ST3146855SS
Includes Tray

Will work in these machiens that support 3.5″ drives
Dell Poweredge 1950 2950 MD1000 MD3000 Or any Dell Server with SAS Backplane

Working Pulls
30 Day Warranty