Effect of Tape Longitudinal Dynamics on Timing Recovery and Channel Performance

McClelland, Grant B.; Beljonne, David; Jubert, Pierre‐Olivier; Imaino, W.; Noguchi, H.; Asai, Masahiko; Takano, H.

doi:10.1109/tmag.2009.2023427

Cited by 15 publications

(6 citation statements)

References 8 publications

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“…7 shows the error performance on a worn (smooth) earlier formulation of BaFe tape (similar to Tape B) [5] written at 2 m/s at a linear density of 480 kbpi, and read with a 3.8-reader in a modified commercial drive. At high velocities, the error rate with the beveled head is reduced by a factor of 2 to 4, whereas at very low tape velocities, the error rate can be reduced by up to a factor of 20 relative to the unbeveled head [8]. The dynamic effect of head tape-friction is primarily to excite a compressional sound wave in the tape, which reflects back and forth between the two rollers on either side of the head at a frequency of 32 kHz.…”

Section: Low-friction Head Technologymentioning

confidence: 96%

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

et al. 2011

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The recording performance of a new magnetic tape based on ultra-fine, perpendicularly-oriented BaFe particles was investigated. Specifically, using a low lateral tape motion demonstration platform, a new servo pattern written on the advanced perpendicularly oriented BaFe medium, a new low friction head technology, a novel synchronous servo channel design, and advanced servo control concepts, we were able to demonstrate a record closed-loop track-follow performance with a 23.4 nm standard deviation of position-error signal, roughly one order of magnitude better than in current tape products. In addition, using read back waveforms captured on the same advanced perpendicularly oriented BaFe medium with a 0.2-m-wide data reader, we demonstrated write/read performance at 518 kbpi using advanced noise-predictive maximum likelihood (NPML) detection schemes. Combining these two results, we estimate that the new medium can support an areal recording density of up to 29.5 Gb/in 2 . This result demonstrates the scalability and extendability of tape technology using low-cost particulate media.

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Section: Low-friction Head Technologymentioning

confidence: 96%

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

et al. 2011

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“…Since (4) considers the bit information of the entire path, the probability of correct detection can be estimated more accurately compared to (3). The correspondence relation between p k estimated from (4) and the tentative decision error of the SOVA detector is shown in Fig.…”

Section: Utilization Of Sova Detectormentioning

confidence: 99%

“…The introduction of powerful error-correction codes such as low-density parity check (LDPC) code to tape storage systems (they have already been applied to current HDD systems) is anticipated to achieve system operation under low SNR conditions, enabling an additional increase in areal recording density. However, at low SNR, a loss-of-lock (LOL) phenomenon in the phaselocked loop (PLL) frequently occurs in currently available timing recovery schemes 3) . Once LOL occurs, the entire sector is corrupted.…”

Section: Introductionmentioning

confidence: 99%

[Paper] A Study on Timing Recovery for High-Recording-Density Tape Systems

Musha

Sakai

Nakamura

et al. 2016

MTA

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Tape systems experience large speed variations compared to disk systems, and therefore, it is necessary to design a stable timing recovery scheme that can operate under a low signal-to-noise ratio (SNR) condition. In such low SNR scenarios, the decision error made by the detector often results in a phase-locked loop circuit losing track of the correct signal. This phenomenon is often called the loss-of-lock (LOL) phenomenon. In order to mitigate the LOL issue, soft information from the soft output Viterbi algorithm decoder is used to control the feedback in the timing recovery loop. Therefore, a timing recovery method for high-density tape storage system is studied in this paper. By applying this new method to the read back signal from the actual tape drive, it is verified that the negative effect of misdetection due to unreliable decisions from the detector can be compensated, with only a minor increase in implementation complexity.

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“…Interaction with the different recording or guiding elements of the tape system can create specific tribological problems (McClelland et al, 2009;Osaki, 1996). For instance, the Figure 2.25 Improvement of durability in still frame mode with DLC coating.…”

Section: Durability Of Metal Evaporated Mediamentioning

confidence: 99%