Vid 346d Pid 5678 Jun 2026

Troubleshooting the "VID 346D PID 5678" USB Device Error A identifier points to a specific hardware issue where your computer fails to recognize a connected USB flash drive or external device. This alphanumeric string is not a standard manufacturer code; instead, it is a generic fallback ID generated by Windows when a device's firmware corrupts.

The FirstChip MpTools (Mass Production Tools) or APTools are specifically designed for this hardware. Fixing Firmware: Tools like ChipGenius can verify the specific controller part number (e.g., Go to product viewer dialog for this item.

You can verify your device's ID in Windows Device Manager by right-clicking the device, selecting Properties , and looking at Hardware IDs under the Details tab. vid 346d pid 5678

If you are experiencing data loss, connection dropping, or write-protection errors on a drive with this ID, the controller chip itself may be reaching the end of its operational lifespan. In such scenarios, avoid saving critical primary backups to the device.

Identifies the product model, usually designated as "Disk 2.0". The fallback name embedded into the drive controller. Controller Hardware FirstChip FC1178BC The microchip that handles data routing and USB protocol. Protocol Version USB 2.00 (High Speed) Maximum theoretical bandwidth of 480 Mbps. Max Power Draw Low power requirement, suitable for all standard ports. Performance Tuning: Optimizing Speed Troubleshooting the "VID 346D PID 5678" USB Device

Move the device from a USB 3.0 port (blue) to a USB 2.0 port (black). USB 2.0 ports offer better compatibility for firmware recovery tools.

Hardware tracking data gathered from benchmark tools like NirSoft USBDeview details the typical real-world speeds for these controllers: ~15 MB/s to 20 MB/s Sequential Write Speed: ~4.5 MB/s to 6.5 MB/s The exFAT Performance Optimization Trick Fixing Firmware: Tools like ChipGenius can verify the

While the "VendorCo" branding often appears in system logs for these devices, the internal hardware varies significantly: Shenzhen SanDiYiXin Electronic Co., LTD (VID: 0x346D). Common Controller Chips: Often utilizes (e.g., FC1178BC) or (e.g., YC2019) controllers. Typical Protocol: Most versions operate on USB 3.0/3.2 Gen 1 protocols, despite sometimes being marketed as faster. Standard Performance: USB 2.0 variants: Typically achieve read speeds of ~15–30 MB/s and write speeds of ~4–12 MB/s USB 3.0 variants: Can reach read speeds between ~80–140 MB/s , with write speeds ranging widely from ~6–60 MB/s depending on the specific NAND flash used. Key Observations & Optimization File System Impact: