Capacity Advantage of Array-Reader-Based Magnetic Recording (ARMR) for Next Generation Hard Disk Drives

This paper proposes an array-reader-based magnetic recording (ARMR) approach for enhancing recording capacity in hard disk drives (HDDs). The HDD industry is now at crossroads to choose a technology that will support continued increase in recording density, and the top contenders are bit patterned media recording (BPMR) and heat-assisted magnetic recording (HAMR) for near-term and 2-D magnetic recording for long-term. Deployment of BPMR and HAMR has been delayed due to the challenges in media and heads. We propose the ARMR approach as a viable technology that can deliver significant capacity by combining array-reader-based readback with modest changes in readback signal processing. Offtrack performance evaluation using waveforms captured at various squeeze levels show that ARMR offers about 30% enhancement in capacity for single-track detection with two or three read elements positioned at different cross-track positions in the track.

[1]  H. Muraoka,et al.  Magnetic Recording in Patterned Media at 5–10 Tb/in$^{2}$ , 2008, IEEE Transactions on Magnetics.

[2]  S. Greaves,et al.  Shingled Recording for 2–3 Tbit/in $^2$ , 2009 .

[3]  P. Asselin,et al.  Recording on bit-patterned media at densities of 1Tb/in2 and beyond , 2006, INTERMAG 2006 - IEEE International Magnetics Conference.

[4]  M. Fatih Erden,et al.  Heat Assisted Magnetic Recording , 2008, Proceedings of the IEEE.

[5]  Bruno Marchon,et al.  The Head-Disk Interface Roadmap to an Areal Density of Tbit/in2 , 2013 .

[6]  Kazuhiko Hosomi,et al.  Microwave-assisted magnetic recording (MAMR) writehead and system , 2015 .

[7]  Roger Wood,et al.  The feasibility of magnetic recording at 1 Terabit per square inch , 2000 .

[8]  Hiroaki Muraoka,et al.  Shingled Magnetic Recording on Bit Patterned Media , 2010, IEEE Transactions on Magnetics.

[9]  Zhen Jin,et al.  Areal-Density Capability of a Magnetic Recording System Using a “747” Test Based Only on Data-Block Failure-Rate , 2008, IEEE Transactions on Magnetics.

[10]  H. Iwasaki,et al.  Future Options for HDD Storage , 2009, IEEE Transactions on Magnetics.

[11]  T. McDaniel.  Ultimate limits to thermally assisted magnetic recording , 2005 .

[12]  Yo Sato,et al.  Thin Spin-torque Oscillator With High AC-Field for High Density Microwave-Assisted Magnetic Recording , 2013, IEEE Transactions on Magnetics.

[13]  J. Zhu,et al.  Microwave Assisted Magnetic Recording , 2008, IEEE Transactions on Magnetics.

[14]  A. Kavcic,et al.  The Feasibility of Magnetic Recording at 10 Terabits Per Square Inch on Conventional Media , 2009, IEEE Transactions on Magnetics.

[15]  H. Miyamoto,et al.  8- ${\rm Tb/in}^{2}$-Class Bit-Patterned Medium for Thermally Assisted Magnetic Recording , 2013, IEEE Transactions on Magnetics.

[16]  J. D. Coker,et al.  Data Handling Algorithms For Autonomous Shingled Magnetic Recording HDDs , 2012, IEEE Transactions on Magnetics.

[17]  M. F. Erden,et al.  Two-Dimensional Magnetic Recording at 10 $\hbox{Tbits/in}^{2}$ , 2012, IEEE Transactions on Magnetics.

[18]  Chubing Peng,et al.  HAMR Areal Density Demonstration of 1+ Tbpsi on Spinstand , 2013, IEEE Transactions on Magnetics.

[19]  Lei Wan,et al.  Bit Patterned Media at 1 Tdot/in2 and Beyond , 2013, IEEE Transactions on Magnetics.

[20]  Ming Jin,et al.  Intertrack Interference Cancellation for Shingled Magnetic Recording , 2011, IEEE Transactions on Magnetics.

[21]  M. Igarashi,et al.  Feasibility of Bit Patterned Magnetic Recording With Microwave Assistance Over 5 Tbitps , 2012, IEEE Transactions on Magnetics.