Based on the product description and notes provided, here is an analysis of the 8-in-1 multifunctional card reader, highlighting its features, limitations, and potential performance bottlenecks.

⚠️ Key Performance Limitation

The most critical detail in this product's description is the statement: "Using 2.0 card reader chip, theoretical speed of 480bps".

This indicates that the core component responsible for reading the memory cards (SD, TF, CF, etc.) is based on USB 2.0 technology. This creates a significant bottleneck.

USB 2.0 Speed: The theoretical maximum speed of USB 2.0 is 480 Mbps, which translates to a real-world transfer rate of approximately 30-40 MB/s.

USB 3.0 Connection: While the device has a USB 3.0 cable and female port (theoretically 5 Gbps or ~500 MB/s), the speed will be limited by the slowest component in the chain. Since the card reader chip itself is USB 2.0, you will not experience USB 3.0 speeds when reading from the card slots.

The USB 3.0 female port on the device might allow a pass-through device (like a USB 3.0 flash drive plugged into it) to operate at higher speeds, but the card reading function will remain slow.

📋 Features and Compatibility

Card Support: It supports a wide range of cards, including SD/SDHC/SDXC, MicroSD/TF, CF, and MS.

Connectivity: The device includes a 0.2m USB 3.0 cable and features a USB 3.0 OTG (On-The-Go) function, allowing it to connect to compatible devices like some Android phones and tablets.

Operating Systems: It is compatible with Windows 7/8/10, Mac OS, and Android.

Usage: It supports hot-swapping (plug and play) and has a blue working indicator light.

📝 Important Usage Notes

Single Card Reading: The device only supports reading one card at a time. Inserting multiple cards simultaneously is not supported.

Hardware Dependency: As with any USB device, the final transfer speed depends on all connected hardware. To achieve the maximum possible speed (which is USB 2.0 speed for card reading in this case), your computer's USB port must also support the corresponding standard. The provided notes correctly explain this principle with the analogy of a 4G phone on a 5G network.

parameter：

Model: 8-in-1 multi-function expander

Interface: SD/TF/MS/CF/TPC/USB3.0

Shell material: ABS

Length: 0.2m

Package includes:

1*Card reader (excluding SD/TF card/CF card/MS card)