507125-B21, harddisk driver, use for proliant sever. G5,G6,G7 , 146G, 10k/rpm,2.5" sas , 6gb/sec, dual port. 507125-B21, harddisk driver, use for proliant sever. G5,G6,G7 ,146G, 10k/rpm,2.5" sas , 6gb/sec, dual port.kit package with tray.all in store, ship after tt advance immediantly. 3yr free warranty.ship all the world with lowest cost. 507125-B21 146g 10k 2.5" 6g sas