Hard drive Caddy is compatible following HP LAPTOPS:

 Probook 6540b, 6440b, 6545b, 5310m, 6445b

NC6400, 6910P, NC6130, NC6230, NC6200, NX6300, 2133, 

NC4400 6930p 8510p 6515b 8710w 8530w 6735s