Today? data? storage? is? dominated? by? the? use? of? magnetic? disks.? Storage densities? of? about? more? than? 5? Gb/cm2? have? been? achieved.? In the past 40 years Arial density has increased by 6 orders of magnitude. But there is a physical limit. It has been predicted that super paramagnetic effects the bit size at which stored information become volatile? as? a? function? of? time? will? limit? the? densities? of? current? longitudinal? recording media to about 15.5 Gb/cm . In the near future century nanometer scale will presumably pervade the field of data storage.? In? magnetic? storage? used? today,? there? is? no? clear cut way? to? achieve? the? nanometer? scale? in? all? three? dimensions.? So? new? techniques? like holographic? memory? and? probe? based? data? storage? are? emerging.? If an emerging technology is to be considered as a serious candidate to replace an existing technology, it should offer long term perspectives.? Any? new? technology? with? better? Arial? density? than today's? magnetic? storage? should? have? long term? potential? for? further? scaling,? desirably down to nanometer or even atomic scale. The? only? available? tool? known? today? that? is? simple? and? yet? offer? these long term perspectives is a nano meter sharp tip like? in? atomic force microscope (AFM) and? scanning? tunneling? microscope? (STM).? The simple tip is a very reliable tool that concentrates on one functionality. the ultimate local confinement of interaction. In local probe based data storage we have a cantilever that has a very small tip at its end. Small indentations? are? made? in? a? polymer? medium? laid? over? a? silicon? substrate.? These indentations serve as data storage locations.? A single AFM operates best on the microsecond time scale. Conventional magnetic storage, however, operates at best on the nanosecond? time? scale,? making? it? clear? that? AFM? data? rates? have? to? be? improved? by? at least? three? orders? of? magnitude? to? be? competitive? with? current? and? future? magnetic recording. The "millipede" concept is a new approach for storing data at high speed and with an ultrahigh density.
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