Magnetic tape

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

29.5- $\hbox{Gb/in}^{2}$ Recording Areal Density on Barium Ferrite Tape

Abstract: The recording performance of a new magnetic tape based on perpendicularly oriented barium ferrite particles was investigated using a 90-nm-wide giant-magnetoresistive reader and a prototype enhanced-field write head. A linear density of 600 kb/in with a postdetection byte-error rate $ was demonstrated based on measured recording data and a software read channel that used a noise-predictive maximum likelihood detection scheme. Using a new iterative decoding architecture, a user bit-error rate of $ can be achieved at this operating point. To facilitate aggressive scaling of the track density, we made several advances in the area of the track-following servo. First, we developed an experimental low-noise tape transport. Second, we implemented an optimized servo channel that together with an experimental timing-based servo pattern enables the generation of position estimates with nanoscale resolution at a high update rate. Third, we developed a field-programmable gate array-based prototyping platform in which we have implemented the servo channel and an $H_{\infty }$ -based track-following controller, enabling real-time closed-loop track-following experiments. Combining these technologies, we achieved a position-error signal (PES) with a standard deviation of 10.3 nm. This magnitude of PES in combination with a 90-nm-wide reader allows the writing and reading of 177-nm-wide tracks at 600 kb/in, for an equivalent areal density of 85.9 Gb/in $^{2}$ . This paper clearly demonstrates the continued scaling potential of tape technologies based on low-cost particulate media.

Electronic book educational publishing method using buried reference materials and alternate learning levels

Abstract: A method for compiling and presenting educational material on an electronic book is disclosed. A set of information requiring a first level of comprehension is created at a terminal or provided from a pre-existing data base. The set of information is examined for words which require a higher level of comprehension. Different types of explanatory information are created for such words and are tagged to the words so that they can be immediately called up when the word is later presented. The compiled first set of information at a first level of comprehension is a first modality. Additional modalities at different levels of comprehension or simply adjusted for different learning styles are also prepared. Each modality is cross-indexed to the other modality at a conceptual meaning level. The conceptual meaning level can be roughly a paragraph long block. The electronic book uses analog storage on a magnetic tape. A magnetic tape is a tape drive mechanism stores textual material of a book in the form of encoded analog signals. The tape reader provides an analog electrical signal which is fed to an analog-to-digital converter for conversion into a digital data stream. A digital buffer capable of storing an amount of data corresponding to at least several pages of text, but not the entire book, is provided. A display coupled to the digital buffer displays a page of textual data from said buffer at any one time. A controller responsive to user input signals advances the tape and replaces the data stored in the buffer with new data to advance through pages of the book. A speech synthesizer may be used in place of the display for visually impaired users.

201 Gb/in 2 Recording Areal Density on Sputtered Magnetic Tape

Abstract: A prototype perpendicularly oriented sputtered tape sample was investigated using a prototype high-moment tape write head and a 48 nm-wide tunneling magnetoresistive hard disk drive read head. A linear density of 818 kbpi with a post-detection byte-error rate $\sigma $ -PES) ≤ 6.5 nm was also demonstrated over a tape speed range of 1.2–4.1 m/s. This magnitude of PES in combination with a 48 nm-wide reader enables reliable recording at a track width of 103 nm corresponding to a track density of 246.2 ktpi, for an equivalent areal density of 201.4 Gb/in2.

Magnetic tape recording and/or reproducing apparatus

Abstract: A magnetic tape recording and/or reproducing apparatus provided with a reversible motor, a rotary member rotated by the motor, an operating mode changer connected to the rotary member to change the operating mode of the apparatus, a tape loader movable in reciprocation between an inoperative position where a magnetic tape can be drawn out from a cassette and an operative position where the tape is drawn out and then wound onto a guide drum, a drive driven intermittently by the rotary member to cause the tape loader to reciprocate between the inoperative and operative positions, and a lock for holding the drive when the tape loader is brought to the operative position. The motor is connected to a housing including therein a speed-reduction device so that the motor output is taken from the peripheral side surface of the motor to drive the rotary member. Thus, the apparatus is highly reliable, small-sized, low in power consumption, and light in weight.

Coin-operated recording machine

Abstract: Recording apparatus for "dubbing" (recording from one to the other) onto a customer's magnetic tape cartridge, selected audio and/or video recordings stored in the apparatus. The apparatus includes means for activating the apparatus, means for selecting the desired recordings, means for identifying and storing data representing the selected recordings for tabulating royalties accrued by playing the selected recording, and magnetic tape cartridge receptacle, transport and recording means for the customer's cartridge. The record selection and recording means may be located directly on the record storage and playback machine or at a remote recording station.