We have with us the world’s first Terabyte or 1000 GB internal hard drive - the Hitachi Deskstar 7K1000. There are a couple of firsts with the 7K1000 and one of them is the 32MB buffer or cache memory used with the 7K1000. A hard drive cache stores the most recent reads requests made to the disc and also pre-fetches the information that is most probably going to be requested like the sector or the sectors succeeding the information just requested. This improves performance as the number of accesses to the hard drive are reduced.
And finally this is the first drive from Hitachi in the 3.5-inch category (3.5-inch is the form factor of desktop hard drives whereas 2.5-inch for laptop hard drives) that features PMR (Perpendicular Magnetic Recording). PMR is used to increase the areal density of the storage media to meet such a large capacity. Perpendicular recording is capable of giving up to 10 times the storage density of the conventional longitudinal recording. Seagate first used PMR in their 750GB hard drive.
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