SanDisk Unveils 256TB SSD for AI – No Cache, Speed Concerns Raised
▼ Summary
– Sandisk announced the UltraQLC SN670, a 256TB SSD set to ship in 2026, marking the company’s largest SSD and targeting AI/hyperscale infrastructure.
– The SSD uses a “Direct Write QLC” approach, skipping SLC cache for better reliability but potentially sacrificing short-burst performance.
– Sandisk claims faster speeds (e.g., 68% faster random reads) but lacks public benchmarks or IOPS data to verify these claims.
– The drive features optimizations like Dynamic Frequency Scaling and improved Data Retention, aiming for longevity and energy efficiency.
– Early enterprise QLC drives showed latency issues, and without confirmed architectural details, the SN670’s real-world performance remains uncertain.
SanDisk has made waves in the storage industry with its groundbreaking 256TB UltraQLC SN670 SSD, designed specifically for AI and hyperscale applications. Slated for release in early 2026, this drive represents the highest-capacity SSD the company has ever unveiled. While it promises impressive density and reliability, questions linger about its performance in real-world scenarios due to its unconventional architecture.
The UltraQLC SN670 leverages a 218-layer BiCS 3D NAND design and employs a Direct Write QLC approach, eliminating the need for traditional SLC caching. This method enhances data integrity and power-loss protection, but experts caution that it may lead to slower response times during burst workloads. Without an SLC cache, the drive could struggle with inconsistent performance under heavy or unpredictable demands, raising concerns for users who prioritize speed.
SanDisk claims the SN670 outperforms competing 128TB Gen5 QLC SSDs, boasting 68% faster random reads and 55% faster random writes in internal tests. Sequential read and write speeds also reportedly improve by 7% and 27%, respectively. However, these claims lack independent verification, as the company has not released detailed benchmarks or IOPS figures.
Key features like Dynamic Frequency Scaling and an optimized Data Retention profile aim to boost efficiency, potentially reducing power consumption and wear by up to 10% and 33%, respectively. Still, without concrete endurance ratings or latency metrics, these benefits remain theoretical.
The drive will debut in a U.2 form factor, with additional variants expected later in 2026. While the 256TB capacity marks a significant milestone for enterprise storage, the UltraQLC SN670 appears tailored for large-scale deployments rather than mainstream use. Early adopters should weigh its high-density advantages against potential performance trade-offs before committing.
For now, SanDisk’s latest innovation signals a bold step forward in storage technology, though its real-world viability remains to be seen.
(Source: techradar)
