Magnetic tape

About: Magnetic tape is a research topic. Over the lifetime, 14062 publications have been published within this topic receiving 77721 citations.

Magnetic recording medium

Abstract: PURPOSE:To use various types of magnetic recording media with high interchangeability for various types of recording devices, by recording previously magnetic characteristic information at a part of a magnetic recording medium. CONSTITUTION:A format contains a magnetic tape 1 itself, a part 2 where the bias current and the equalizer time are recorded as the magnetic characteristic information, and an unrecorded part 3 which can be used by a user. It is ideal to record the magnetic characteristic information by converting the bias current into a coefficient since the absolute current value of the bias current differs by magnetic heads. For a magnetic disk 4, the optimum recording current coefficient is recorded as the magnetic characteristic information at a part of the most outer circumference of an encoder and on the basis of the format. A magnetic head 7 functions as a magnetic sensor which reads the magnetic characteristic information of the disk 4 and also serves as a reading/writing head which can function as a writing head to record the data on a magnetic disk 5. An amplifier 8 converts the signal which read the magnetic characteristic information through a magnetic head 7 into the pulse signal.

Optical disk system emulating magnetic tape units

Abstract: An optical disk system emulating a 3480 magnetic tape subsystem having one or more magnetic tape drives, includes a VMEGate channel attached processor for receiving CCW tape commands, a SCSI board for controlling SCSI optical disk drives, a serial I/O board for controlling jukebox optical disk media handlers for automatically robotically loading and unloading optical disks containing virtual tape data into the optical disk drives, a cache RAM for buffering data between the channel and the optical disk drives, operator consoles for emulating the 3480 magnetic tape subsystem control panels, an SBC computer and VME bus for central control of the system, and floppy and hard disk drives for storing emulation SBC programs and disk directories, to enable the system to exhibit an organization of virtual tape data into a system of pointers and user records of the virtual tapes, a reallocatable mapping between magnetic tape drives and the optical disk drives, disk directories cross referencing virtual tapes VSNs to optical disks for locating particular optical disks storing requested VSNs, and to enable WORM optical media to appear to the channel as rewritable magnetic tape through the conversion of tape commands to jukebox load operations and optical disk drive seek operations for increased performance, said system emulates a 3480 magnetic tape subsystem by using jukeboxes to automatically load optical media into and out of optical disk drives and by using a dynamic re-allocation method for maintaining a one-to-one mapping between the virtual magnetic tape drives and the optical disk drives, which reduces access speed to the data.

Magnetic tape storage media having RFID transponders

Abstract: A magnetic tape information storage media includes a cassette housing having one or more spools for holding a length of magnetic tape and an integral radio frequency identification (RFID) transponder. The RFID transponder may be utilized by an external system to provide functions such as, automated sale, rental, or loan of the media, authentication of the media, indexing of information recorded to the media, enablement/disablement of playback of the media, recording of the number of times the media has been played, inventory, and the like.

Method and apparatus for producing an audio magnetic tape recording from a preselected music library

Abstract: The invention relates to a method and apparatus for choosing a random group of musical selections which are housed in a prerecorded disk library and creating an individual customized tape cassette from the selections chosen. Through use of the present invention, a multiplicity of selections from a selection music library are chosen and electrically transmitted to a selection duplicating center where they are duplicated at high speed onto a blank recording tape cassette in the desired order selected. The duplication process is performed at high speed in order to enable the cassette to be made in only a few minutes from the selections chosen.

Ferromagnetic resonance of particulate magnetic recording tapes

Abstract: The room‐temperature ferromagnetic resonance (FMR) spectra of γ‐Fe2O3, CrO2, and barium ferrite particulate magnetic recording tapes have been measured at microwave frequencies of 9.35 and 35 GHz for various orientations of the static and high‐frequency magnetic fields with respect to the tape. For CrO2 tapes, the influence of the width of the angular distribution of the particle orientations on the FMR spectra has been studied from the nearly isotropic case up to the highly oriented case. Hysteretic behavior for a CrO2 tape as well as the effect of tape calendering for a γ‐Fe2O3 tape has been observed by FMR. Experimental results are found to be in reasonable agreement with results of theoretical calculations based on a model of an ellipsoidal single‐domain particle with both shape and magnetocrystalline anisotropy. Magnetostatic interaction inside the magnetic film has been introduced by expressing the total magnetostatic energy as a combination of a part dependent on particle shape and a part dependent...