John W Stewart

Title: John W. Stewart: Innovator in Disk Array Storage Systems

Introduction

John W. Stewart is a notable inventor based in Wichita, Kansas, recognized for his contributions to the field of disk array storage systems. With a total of 9 patents to his name, Stewart has made significant advancements in technology that enhance data storage and processing capabilities.

Latest Patents

One of Stewart's latest patents is the "Disk array storage system architecture for parity operations." This invention presents a high-performance scalable hardware architecture for a disk array storage subsystem that supports various RAID modes, including 0, 3, 4, and 5. The architecture is designed with a high bandwidth parity calculation engine and a buffered PCI interface that operates at the full speed of the PCI bus. Additionally, it features dedicated local memory that is dual ported, allowing PCI and parity operations to occur concurrently. This innovative design enables parity calculations and memory block moves without interfering with the controller processor, thereby optimizing the management of array task control.

Another significant patent is the "Digitally controlled delay circuit." This invention involves a first inverter circuit connected between a voltage source and a reference potential through a series of cascaded transistors. Each transistor has a control gate that can be selected to adjust the resistance, controlling the charging rate of a distributed capacitance. The output circuit provides an inverted buffered output and can be connected to form a cascaded delay circuit, enhancing the functionality of electronic systems.

Career Highlights

Throughout his career, John W. Stewart has worked with prominent companies such as NCR Corporation and Hyundai Electronics America, Inc. His experience in these organizations has contributed to his expertise in developing innovative technologies.

Collaborations

Stewart has collaborated with notable individuals in the field, including Rodney A. Dekoning and Philip W. Bullinger. These partnerships have likely fostered an environment of creativity and innovation, leading to the development of groundbreaking technologies.

Conclusion

John W. Stewart's contributions to disk array storage systems and digital circuits exemplify his innovative spirit and technical expertise. His patents reflect a commitment to advancing technology and improving data management solutions.