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The is a low-cost, single-chip USB 2.0 flash drive controller designed by Silicon Motion, Inc. It is widely used in budget-friendly USB sticks, promotional flash drives, and DIY repair tools. Its main claim to fame is supporting dual-channel (2CE) NAND flash and an unusual "Normal + Fake" mode (also known as "Split Mode" or "Dual Density Mode").

SMI MPTool SM32X \ SM34X [SMI Mass Production Tool] - USBDev.ru sm3271ac1