Weldon Mark Hanson

Implementing BER-list modulation code for hard disk drives

Implementing enhanced track following during read back using head asymmetry metrics in hard disk drives

Magnetic recording disk drive with write position error signal values written in the data tracks for compensation of track misregistration

Disk drive with channel and preamp with dynamic write-current control for write head

Magnetic recording disk drive with write current overshoot amplitude (OSA) responsive to data transitions

System and method for testing data storage systems utilizing micro-transitions

Disk drive with different data sector integrated preambles in adjacent data tracks

Disk drive with different synchronization fields and synchronization marks in the data sector preambles in adjacent data tracks

Disk drive with distributed codeword blocks

Implementing combined phase and amplitude magnetic defect detection on-the-fly

Implementing channel signal processing assist with ECS contact detection

Implementing magnetic defect classification using phase modulation

Detection of synchronization mark from output of matched filter upstream of Viterbi detector

Multi-bit phase alignment for synchronization mark pattern matching

Data storage device with data recovery process using fixed phase clocking for analog-to-digital conversion

Method and apparatus for enhanced data channel performance using read sample buffering

Formatting method and apparatus for a direct access storage device