SK hynix Unveils First HBF Standard Specifications with Sandisk

SK hynix Inc. announced in collaboration with Sandisk that it has unveiled the first standard specifications for High Bandwidth Flash (HBF), a next-generation storage technology.

The announcement coincides with the opening of ‘FMS (Future of Memory and Storage) 2026,’ held at the Santa Clara Convention Center in California from August 4 to 6 (local time). The company is set to present HBF as a key technology to overcome memory bottlenecks in the AI era through keynote speeches and panel discussions during the event.

HBF technology is a new memory layer between HBM and SSDs. It enables high-speed data transfer similar to HBM while significantly expanding capacity by leveraging NAND technology. With the expansion of AI inference driving a surge in data volumes to process, HBF is gaining attention as a technology that simultaneously resolves bandwidth and capacity scalability challenges.

This milestone comes about six months after launching the consortium in February this year, following the initial standardization partnership with Sandisk in August 2025. Capacity specifications cover up to 512GB based on two stack configurations (8-high and 16-high NAND dies). Bandwidth is categorized into three grades (Grade1~3), delivering scalable performance from approximately 0.4TB/s to 3.0TB/s.

A key highlight is the interconnect linking HBF technology and processors. HBF technology adopts UCIe*, an industry standard connection interface, laying the groundwork to flexibly integrate HBF technology across different processor types, including GPUs and CPUs.