As the CAP and TPI are increasing quickly, pc users get hard drives of bigger and bigger capacity, each platter can hold much more than before. WD20EFAX-xxFB5Nx 2TB, 1 platter 2 heads WD30EFAX-xxJH4Nx 3TB, 2 platters 3 heads WD40EFAX-xxJH4Nx 4TB , 2 platters 4 heads WD40EMAZ-xxTKPBx 4TB, 2 platters .
The following are Seagate Samsung SpinPoint M8U hard drives. They look like Seagate models but actually Samsung hard drives, Samsung PCB and Samsung Technologies.