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In this study, we prepared some kinds of lubricants with different numbers of a hydroxyl end group (Z-03, Z-dol, Z-tetraol, and Z-TMD) and measured the adhesion and friction forces on the disks for different lubricant thicknesses. We successfully obtained these forces as a function of lubricant film thickness. The adhesion and friction forces were smallest on the disk with Z-03; the adhesion force...
We fabricated super smooth probes for pin-on-disk sliding tests by applying a gas cluster ion beam (GClB) to glass convex lenses. Using these probes, we measured the friction forces exerted on magnetic disks coated with molecularly thin lubricant film. Periluoropolyethers (PFPE) lubricant films with a different number of hydroxyl end groups were compared and indicate that the newly developed probe...
Lubricant pickup on different PFPE lubricant (Z-tetraol, D-40H, and QA-40) film was compared by the slider surface analyzing tester (SSA tester) developed to observe the lubricant thickness mapping on the slider surfaces after the heads flying on the disk surfaces. These lubricants have same four OH functional end-groups, however, these have the different backbone. Z-tetraol showed smallest amount...
The number of content-generation devices is expected to increase explosively in the near future thanks to evolution in the field of input/output devices and consumer generated media (CGM) tools. Users will simultaneously wear communicating sensor devices wherever they are, whenever they need them, and whatever they are doing. Under such circumstances, various contents will be generated,updated by...
The session Initiation Protocol (SIP) is a widely used application-layer control protocol. The processing load of the SIP protocol is reportedly seen as one of the potential problems which may limit the range of its application although it has a number of advantages. Many research efforts have been made and have come up with various compression algorithms to reduce the packet size in order not to...
Advanced head disk interface (HDI) system assisted by gas Perfluoropolyether (PFPE) lubrication was discussed in this paper. It is known that the lubricant spins-off under the high-rotation-speed and high temperature. Our proposing HDI system showed high performance without the lubricant spin-off and redistribution. That was to drip only small amount of lubricant on the slider suspension. This lubricant...
Three kinds of PFPE lubricants (Z-tetraol, TA-30, D-4OH) with different molecular structures were coated on the magnetic disks, then we confirmed the film conformation of these lubricants on the disks by the AFM with the fluoride coated probe. The film conformations of these lubricant films were different. Z-tetraol showed highest film thickness and lower coverage in these lubricants. TA-30 showed...
In this paper, we give a quantitative evaluation on the effect of integrating WiMAX and Wi-Fi, as compared to the case of separate WiMAX and Wi-Fi systems, on the system capacity with QoS being considered. We focus particularly on the VoIP traffic aspects of the system. Based on this capacity evaluation, a cost analysis is further presented. We also propose and analyze a resource management scheme...
The textured pad slider vibration on magnetic recording disks is estimated with different friction force. This phenomenon is studied by simulation of the stick-slip vibration of the slider on touch down height and take-off height measurement at spin-down/spin-up motion. Results show that the head-disk contact hysteresis become smaller as the friction force decreases. The simulation is confirmed through...
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