Magnetic tape recordings suffer from nonlinear distortions, mainly due to saturation effects. We model the audio signals using a linear Autoregressive (AR) model with additive Gaussian noise and the recording procedure with a nonlinear measurement function. To analyze the nonlinearities we perform measurements on magnetic tape devices in saturation. Due to ferromagnetic effects a nonlinearity w...

Archival demands for digital tape storage systems require smaller spacing between data tracks on the magnetic tape to allow for more data storage on a single cartridge. Increasing track density while maintaining track following provides a challenge for the servo control of the tape drive. In particular, interchangeable tape cartridges and time-varying tape reel diameters during operation cause ...

The Bell & Howell Enhanced-NRZ recording reproducing technique for bit packing densities up to 40,000 per track inch is described in this paper. Utilization of the pulse code modulation format of Enhanced-NRZ achieves this high density with a bit error rate of one in ten million. Bell & Howell’s standard VR-3700B instrumentation tape recorder and wideband instrumentation recording tape are used...

The design of a magnetic head for use in the tape drive portion of the IBM 3480 Magnetic Tape Subsystem required that advances be made in track density and linear recording density while meeting requirements for signal quality, manufacturability, and reliability. The design that was developed to fulfill these needs combines ferrite pole-pieces, magnetoresistive read elements, and planar-deposit...

Recent attention on global environmental changes has stimulated the development of large scale global information systems. Satellite images play a very important role for understanding these global changes, but their data size are very large. Magnetic tape archivers are often used for them because of their capacity, but their capacity cannot be increased except by adding a new archiver which is...

Lubrication with ambient air is not quite generally applied. The best known application is the “foil bearing” in tape recording systems for audio, video and computer applications; where the gap height that is needed for effective lubrication may quite easily be attained. This air gap reduces tape friction and wear of tape and recording head substantially. On the other hand, though, the air gap ...

We analyzed the current distribution in three Bi-2223/Ag tapes with different filament lay-out, comparing the results of magnetic knife and Hall probe experiments. Detailed knowledge of the current distribution can be useful for the diagnostics of HTS conductors. The lateral current distribution was measured with the non-destructive magnetic knife technique and used to calculate the correspondi...