VID 346D
The identifiers and PID 5678 correspond to a generic, often low-cost USB flash drive mass-produced by VendorCo . These devices typically utilize FirstChip controllers (specifically the FC1178BC or FC1179 series) and are notorious in the tech community for being used in "fake capacity" drives. Hardware Identity & Reliability
VID 346D PID 5678
If your device shows , do not waste time with the default Windows driver. The best patched driver is overwhelmingly the modified CH340/CH341 driver (version 3.8 or later), installed after temporarily disabling signature enforcement. For non-serial devices, use Zadig’s WinUSB patch.
VID (Vendor ID):
In the world of hardware, these IDs are your device's fingerprint: 346D identifies the manufacturer. PID (Product ID): 5678 identifies the specific model.
. These devices are frequently identified by systems as "VendorCo ProductCode" or "Disk 2.0" and are known for their varied performance and high likelihood of containing repurposed or "black-label" flash memory. The Identity of VID 346D / PID 5678
Decoding the Matrix: The Ultimate Guide to Fixing "VID_346D&PID_5678" (Finding the Best Patched Driver)
Performance:
Extremely inconsistent. Users report speeds as low as 0.7 MB/s once the drive is partially filled. While some "genuine" versions can reach 19 MB/s read and 6.5 MB/s write , performance often degrades significantly under load.