PORTLAND, Ore. Perpendicular recording techniques promise to more than double density capabilities in the next few years, increasing from the 200 Gbits/inch2 that longitudinal recording techniques pack today to as high as 500 Gbits/inch2.
Fujitsu Laboratories Ltd. proposes that to double density again, to the terabit per square inch domain, researchers add nanoscale patterns to preformat the location of bit cells in perpendicular media. This is a capability it demonstrated recently in cooperation with nearby Kanagawa Academy of Science and Technology (Japan).
Fujitsu and Kanagawa Academy recently showed a prototype of what they described as the world's first alumina nanohole-patterned media which could be validated with a flying head read/write operation on a 2.5 inch magnetic disk. The aligned alumina nanohole patterns used a 100-nm pitch by virtue of nanoimprint lithography. The resulting patterned bit cells could be isolated for reading and writing with existing read heads.
Next Fujitsu plans to test its media with the nanoholes cranked down to a pitch of 25 nm—the density required to reach its ultimate goal of one terabit per square inch densities. The media has already been fabricated, Fujitsu says, but a new type of trailing shield head that is not yet available will be needed to read and write to the terabit per square inch media.
With the new heads, Fujitsu predicts that its one Terabit per square inch media will enable storage capacities of up to 1.2 TB on a two-platter, 2.5-inch drive. Their nanohole-patterned media project, which is not expected to appear in drives for five to 10 years, was supported by the Research Program on Development of Innovative Technology" of the Japan Science and Technology Agency.