Characterization and detection of PPM-encoded servo signals in tape drives

Cherubini, Giovanni; Cideciyan, R.D.; Eleftheriou, Evangelos; Jelitto, Jens

doi:10.1109/pacrim.2009.5291349

Cited by 6 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9, but have modified the pattern geometry to enhance the performance of the servo system. To analyze the impact of the individual servo pattern parameters on the overall servo performance, we developed a model of the servo readback signal that includes the servo reader width , the azimuth angle , and the pulse width at 50% amplitude as parameters [17], [18].…”

Section: B Servo Pattern Designmentioning

confidence: 99%

“…Second, a narrower servo reader width is needed to avoid the dispersion of the readback waveform, as illustrated in Fig. 10, where the dibit shapes have been obtained using the dibit response described in [17] and [18]. A narrow servo reader width results in a smaller servo signal amplitude, and hence in a lower signal-to-noise ratio (SNR).…”

Section: B Servo Pattern Designmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2011

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: B Servo Pattern Designmentioning

confidence: 99%

Section: B Servo Pattern Designmentioning

confidence: 99%

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

et al. 2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…The sequence of lateral position estimates is used to generate a position-error signal (PES) that is fed back to the track-following servo, whereas the tape velocity estimates and the longitudinal position information are fed back to the reel-to-reel servo. A model of the readback servo signal to analyze the impact of the various TBS elements on the overall servo performance has been developed in [35] and [36].…”

Section: B Timing-based Servo and Synchronous Servo Channelmentioning

confidence: 99%

Control Methods in Data-Storage Systems

Cherubini

Chung

Messner

et al. 2012

IEEE Trans. Contr. Syst. Technol.

Self Cite

View full text Add to dashboard Cite

Abstract-The recording performance of data-storage devices, in which write/read elements move relative to a storage medium to reliably store and retrieve information, depends on the capability of servo mechanisms to provide the necessary positioning accuracy. The desired characteristics of servo mechanisms for datastorage systems include robustness against variations of environmental parameters, high resolution, accuracy, stability, and fast response. This paper presents a comprehensive overview of advanced servo-control methods for data storage. The applications are to well-established recording technologies, including magnetic tape and magnetic disk systems as well as CD/DVD/Blue-Ray optical data-storage systems. Moreover, newer holographic and nearfield optical systems and the emerging probe-storage technology are also addressed. Emphasis is given to the potential exhibited by the technologies considered for achieving ultra-high storage capacity, as required by the exploding demand in data-storage capacity for archival systems and massive multimedia data storage.Index Terms-Control systems, hard-disk drive, holographic data storage, optical-disk drive, scanning-probe data storage, servomechanism, tape drive.

show abstract

Robust embedding of longitudinal position into tape servo signals

et al. 2011

Self Cite

View full text Add to dashboard Cite

In linear tape open technology, the longitudinal position (LPOS) on magnetic tape is embedded into the timing-based servo format by modulating the positions of magnetic transitions during the servo-writing process. An efficient method for embedding LPOS information into tape servo signals that is robust to LPOS detection errors is presented. The proposed concept is based on the serial concatenation of three data-processing stages: a lossless compression stage with a fixed compression ratio, an errorcorrection coding (ECC) stage and a runlength-limited coding stage. Various algorithms have been designed to compress and decompress the LPOS information. Errorcorrection codes, such as Hamming codes, Reed-Solomon codes and Golay codes, are used to protect LPOS and manufacturing information from detection errors. Finally, the random-error and the burst-error performance of various compression/ECC schemes are evaluated by computing the LPOS word error rate for servo signals corrupted by additive white Gaussian noise and by determining the burst-error correction capability of the proposed LPOS formats, respectively.

show abstract

Characterization and detection of PPM-encoded servo signals in tape drives

Cited by 6 publications

References 7 publications

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

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

Control Methods in Data-Storage Systems

Robust embedding of longitudinal position into tape servo signals

Contact Info

Product

Resources

About