DapuStor's dual-mode SSD trades capacity for faster pSLC writes
DapuStor has introduced a firmware-based dual-mode configuration for its J5060 enterprise SSD that dedicates a portion of QLC NAND to run as pseudo-SLC, boosting random write performance by over seven times. The trade-off reduces usable capacity by 6% to 20%, depending on the model, but eliminates the need for dedicated SLC flash. The drive is available in capacities up to 122.88TB and is expected to ship without a set price or release date yet.
The J5060's dual-mode design lets operators partition QLC cells into a fixed pSLC region exposed as a separate block device, with the remainder running at full QLC density. DapuStor's firmware achieves this through die-level isolation, optimized SLC reserve allocation, and region-aware I/O scheduling. The pSLC region delivers over 25 times the program/erase endurance of the QLC portion.
The approach builds on an NVMe specification framework dating to 2019, though earlier commercial attempts like the Enmotus FuzeDrive P200 struggled with pricing. DapuStor targets workloads such as database journals, write-ahead logs, and metadata caches, positioning the drive as a replacement for dedicated SLC hardware. Capacities span 15.36TB to 122.88TB in U.2 form factor, with the 30.72TB model rated at 30,000 random-write IOPS.
This drive could reshape how enterprises approach storage tiering, potentially reducing the need for separate SLC-based devices in database and logging environments. Organizations managing large data volumes may benefit from consolidated hardware, though the capacity trade-off and lack of pricing make adoption uncertain. Smaller firms without dedicated storage engineers might find the dual-mode configuration complex, while larger data centers could see operational savings. The technology's success may depend on whether reliability concerns about QLC endurance prove manageable in production settings.