Seagate has made a 1 TB/in² hard drive which would hold 60,000 GB on a 3.5 in hard drive. The bits are iron platinum with a stronger magnetization than the cobalt platinum used currently. The magnetic field required for writing would be too high so a laser is used to heat (650 K) the bit above the Curie point; the magnetic field is then applied followed by rapid cooling to retain the recorded information.