A Study of SMR/TDMR With a Double/Triple Reader Head Array and Conventional Read Channels

Elidrissi, Moulay Rachid; Chan, Kheong Sann; Yuan, Zhimin

doi:10.1109/tmag.2013.2283884

Cited by 15 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The double and triple readers perform better when the effective reader pitch is non-zero within a certain range. 8 Second, we observe that the triple reader performs than the double reader as shown by a wider 747 bodies, e.g., 2 A À vs 3 A À . In the triple reader structure, the readers are collinear.…”

Section: B Reading Processmentioning

confidence: 74%

See 1 more Smart Citation

Skew angle effects in shingled magnetic recording system with double/triple reader head array

Elidrissi

Chan

Greaves

et al. 2014

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

Articles you may be interested inEffect of media property variations on shingled magnetic recording channel bit error rate and signal to noise ratio performance Bit error rate performance for head skew angle in shingled magnetic recording using dual reader heads Design of a robust underwater acoustic communication system over multipath fading channels AIP Conf. Proc. 1495, 465 (2012); 10.1063/1.4765943 Skew angle, media orientation and head-disk spacing change in proximity recording systems

show abstract

Section: B Reading Processmentioning

confidence: 74%

“…6 and 7. In our previous study, 8 an SMR system with 2 or 3 reader array was evaluated at zero skew. In this work, we run micromagnetic simulations at different skew angles to train the grain flipping probability (GFP) model, 9 and then evaluate uncoded channel error rate performance at different skews.…”

mentioning

confidence: 99%

Skew angle effects in shingled magnetic recording system with double/triple reader head array

Elidrissi

Chan

Greaves

et al. 2014

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Both simulation and experiment studies [8], [9] on the TDMR reader show off-track read capability improvement and the ability of reproducing a narrower track by a relatively wider reader. On the testing stand, the shingled writing is able to achieve up to 30% AD gain tested by the same head and medium.…”

Section: Introductionmentioning

confidence: 92%

Dedicated Servo Recording System and Performance Evaluation

et al. 2015

View full text Add to dashboard Cite

The perpendicular magnetic recording (PMR) in hard disk drives is approaching its physical limitation. The emerging technologies, such as heat assisted magnetic recording and microwave assisted magnetic recording have been proposed to record on magnetic media with thermally stable smaller size grains at higher areal density (AD). However, in the media fabrication, achieving wellisolated small size of grains is more challenging than obtaining high K u material as recording media. Reducing the number of grains per bit is a major path for keeping AD growth of PMR in recent years. To minimize the SNR penalty at a smaller grain number per bit, pushing more on track density is the right approach. With the 2-D magnetic recording (TDMR) readers for inter-track interference cancellation, the off-track read capability is improved significantly for allowing a narrower track read. In the drive working environment, when the external vibration or other mechanical disturbance happens during the writing process, it creates more track squeeze at adjacent tracks and leaves a very narrow track at some locations of the track. When the track width is narrower than the squeeze to death width in the 747 curve, it causes hard failure in the channel. To solve the track squeeze problem, this paper proposes to add an additional magnetic recording layer in between the data recording layer and the soft underlayer of conventional PMR media. This additional recording layer is used to record servo information only. The continuous positioning error signal is able to improve the servo performance and to provide the real-time monitoring of the positioning error. When it is under bad servo conditions, the writing process can be stopped to avoid nontolerable track squeeze. The continuous servo signals are designed to be of moderate intensity at very low frequency, and its impact on data signal has been minimized. The linear density gap between the dedicated servo media and the conventional PMR media is able to be controlled within 3%. As the dedicated servo system keeps only around 100 wedges of track ID and sector ID at the data layer, the surface area saving at the data layer can break even in capacity. The dedicated servo technology together with TDMR readers is the key technology to achieve ultrahigh track density during both writing and reading processes.Index Terms-Continuous position error signal (PES), dedicated servo, dedicated servo media, perpendicular magnetic recording (PMR), servo control.

show abstract

“…Another future concept to increase areal density is two-dimensional magnetic recording (TDMR) where a multiple-read-sensor design is utilized to correct for side reading [96,97]. An example of such a three-read-sensor TDMR design with two bottom sensors and one top sensor is shown in Fig.…”

Section: Outlook: Other Technologiesmentioning

confidence: 99%

Physics and Design of Hard Disk Drive Magnetic Recording Read Heads

Maat¹,

Marley²

2014

Handbook of Spintronics

View full text Add to dashboard Cite

Magnetic recording heads always have been on the forefront of technology. A finished magnetic recording head that is manufactured in high volume is the outcome of a coordinated effort of various scientific and engineering disciplines. This chapter will focus on the physics and design of modern magnetic recording read heads. It will explain the underlying concepts of thin film magnetism and electron transport in nanostructures and describe the aspects of device scaling, magnetic stabilization, signal-to-noise considerations, and read-back performance of currently employed tunnel magnetoresistive read heads. An outlook on possible future read-head technologies such as currentperpendicular-to-the-plane giant magnetoresistance, scissor, two-dimensional magnetic recording, and spin-torque sensors will be given. List of Abbreviations

show abstract

A Study of SMR/TDMR With a Double/Triple Reader Head Array and Conventional Read Channels

Cited by 15 publications

References 10 publications

Skew angle effects in shingled magnetic recording system with double/triple reader head array

Skew angle effects in shingled magnetic recording system with double/triple reader head array

Dedicated Servo Recording System and Performance Evaluation

Physics and Design of Hard Disk Drive Magnetic Recording Read Heads

Contact Info

Product

Resources

About