Mptool Fixed: Tc58nc6623 Sss6698ba

The SSS6698-BA is a single-channel USB 3.0 NAND flash controller from Silicon Motion. It supports several NAND vendors, including Toshiba (now Kioxia). The TC58NC6623 marking typically indicates a Toshiba 3D TLC NAND die. In mass production, these drives are initialized by vendors using an MPTOOL. When firmware metadata is corrupted — due to unsafe ejection, voltage fluctuation, or bad blocks — the controller enters a factory mode or reports incorrect parameters. Users then see:

Standard OS tools cannot fix this. The solution requires low-level access via MPTOOL.

Document ID: TR-SMI-6698-2025
Revision: 1.0
Target Device: USB 3.0 Flash Drive with Silicon Motion SSS6698-BA controller & TC58NC6623 (Toshiba) NAND tc58nc6623 sss6698ba mptool fixed

If you can’t find the exact tool, tell me:

I’ll give you the exact matching tool version number and settings. The SSS6698-BA is a single-channel USB 3

If the pre-made MPTOOL fails to recognize your drive, you can create a custom fixed configuration.

  • Go to "Flash Setting":
  • Go to "Device Setting":

    • Silicon Motion’s SSS6698-BA controller, often paired with Toshiba TC58NC6623 NAND flash, is found in many budget USB 3.0 drives. These drives frequently suffer from firmware corruption, incorrect capacity detection (e.g., 8MB or 0MB), write-protection, or device not recognized issues. This paper presents a verified method to restore full functionality using a specific MPTOOL (Mass Production Tool) version and configuration parameters tailored for the TC58NC6623. A step-by-step recovery procedure, common failure points, and post-repair validation are provided. Standard OS tools cannot fix this

    If you are reading this, your USB flash drive is likely showing up as "Generic Flash Disk" with 0 bytes, or Windows is asking you to "Insert a disk" when it is already plugged in. This is a common firmware corruption issue for drives using the TC58NC6623 (Toshiba/Kioxia) controller, often identified by tools as the SSS6698BA.

    Here is the step-by-step guide to fixing it using the SSS MPTool.

    Your drive needs the "fixed MPTOOL" if you observe any of these:

    Caution: Do not attempt standard formatting. It will fail or worsen the issue.

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