HP 336989-001 - 40.0GB ATA-100 EIDE hard drive - 4,200 RPM, 2.5-inch form factor, 9.5mm height Retail
HP 336991-001 - 60.0GB ATA-100 EIDE hard drive - 5,400 RPM, 2.5-inch form factor, 9.5mm height Retail