Nonlinear intersymbol destruction versus linear intersymbol interference on high density disk drives

2003 ◽  
Author(s):  
R.D. Barndt ◽  
J.K. Wolf
Keyword(s):  
Intersymbol Interference ◽  
High Density ◽  
Disk Drives

Investigation of Graph-Based Detection in Iterative Decoding for Bit-Patterned Media Recording

2014 ◽  
Vol 979 ◽  
pp. 58-61
Author(s):  
Piya Kovintavewat
Keyword(s):  
Iterative Decoding ◽  
Intersymbol Interference ◽  
High Density ◽  
Soft Information ◽  
Experimental Results ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Recording Density ◽  
Moderate Complexity ◽  
Intertrack Interference

High-density bit-patterned media recording (BPMR) can be obtained by reducing the spacing between data bitislands in both the along-and across-track directions, thus leading to severe intersymbol interference (ISI) and intertrack interference (ITI) because of small bit and track pitches, respectively. Here, we propose to use the graph-based detector, instead of the trellis-based detector, in iterative decoding to combat the ISI and the ITI for a multi-head multi-track BPMR system. Specifically, the readback signal is sent to the graph-based detector before iteratively exchanging the soft information with a decoder. Experimental results indicate that at low to moderate complexity, the proposed scheme outperforms the existing schemes, especially at high recording density.

A MEMS-based tracking milli-mirror for high-density optical disk drives

2007 ◽  
Vol 133 (2) ◽  
pp. 368-374 ◽  
Author(s):  
J.P. Yang ◽  
L.N. Low ◽  
D. Johnson
Keyword(s):  
Optical Disk ◽  
High Density ◽  
Disk Drives
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