Vid: 346d Pid 5678

This is the classic "fake capacity" scam. The flash memory chip on your drive is physically only 4GB or 8GB. A dishonest manufacturer modified the controller's firmware to report 128GB. Your operating system believes it, but any data written beyond 4GB will corrupt. An MP tool will show the real capacity during formatting.

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Like many budget flash drives, the "real" usable size is often slightly lower than the official packaging (e.g., a 64GB drive showing ~58.6 GB) due to formatting and overhead. Common Associated Brands

When tested sequentially (reading and writing large single files), drives with these identifiers frequently show robust USB 3.2 Gen 1 performance. However, it is important to remember that copying numerous small files (like photos or documents) will generally result in lower read/write speeds than sequential testing. If you want to test the read and write performance of your own flash drive, you can use benchmarking utilities like the USBDeview Utility to calculate your drive's MB/sec speeds. Troubleshooting Common USB Issues

The most common cause of hardware failure for niche USB IDs is a missing or corrupted driver. vid 346d pid 5678

If the issue is a glitched Windows driver stack, forcing a clean wipe of the device node can fix it. Right-click the and select Device Manager .

The performance and hardware of these devices can vary significantly because the VID/PID combination is shared across different production batches and capacities. Interface Support : Devices with this ID have been reported with both USB 3.0/3.2 capabilities. Performance Read/Write Speeds : Standard 64GB models often reach approximately for both reading and writing. Benchmark Issues

If you are dealing with a broader slow-transfer scenario on a system-wide level, verify your OS optimization parameters by utilizing Guiding Tech's USB Speed Fix Walkthrough to toggle Windows drive caching policies.

Select the device from the USB Device Tree and look for the and Product ID fields in the bottom pane. Troubleshooting Common Issues with VID 346D PID 5678 This is the classic "fake capacity" scam

While the VID/PID tell you it's a FirstChip, you need the exact controller model (e.g., FC1178, FC1179) to use the right tool.

Independent benchmarking from community hardware testers indicates that the standard Windows FAT32 configuration severely bottlenecks the performance of the VID_346D&PID_5678 device.

A lookup of these specific identifiers reveals their origin:

A unique 16-bit number assigned by the USB Implementers Forum (USB-IF) to a specific manufacturer. Your operating system believes it, but any data

When you connect a USB device to your computer, the operating system reads its VID and PID to load the appropriate driver. In the case of VID = 346D PID = 5678 , the vendor is officially tied to , a well-known Chinese consumer electronics brand. The device name associated with this ID is most commonly Teclast CoolFlash . However, as we will explore, this particular identifier has become a victim of its own popularity, being widely cloned and misappropriated by unscrupulous manufacturers worldwide.

No. A significant number of drives, especially those sold by official Teclast distributors, are legitimate. However, due to the prevalence of the default ID in FirstChip's reference tools, the vast majority of unbranded, promotional, or suspiciously cheap drives using this ID are counterfeit.

Deep-dive diagnostics show these units are built on a FirstChip (一芯) micro-controller , frequently using part number chipYC2019 or the FC1179 series.

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.