In order to improve the customers buying experience and self-help to answer questions, some FAQs of Alxum card reader are as follow for your reference:
1. What is the maximum capacity of your memory card supported by Alxum USB Reader?
Answer: Alxum usb card reader supports the SD/SDHC/SDXC specification. In theory, it supports a maximum of 2TB. In fact, there is no such a large memory card, it's also ok with 128G.
2. What is the speed of the USB interface of Alxum Card Reader?
Answer: It based on USB3.0 5Gbps technology，which could enjoy ultra-high speed transmission.
3. Is the USB3.0 backwards compatible with 2.0?
Answer: Yes, it's fully compatible with 2.0 with transfer the rates up to 5Gbps.
4. What should I do if I am prompted to insert a memory card to format it?
Answer: This phenomenon may be caused by his memory card being formatted on other devices. The format you used has compatible problem with the current card reader.
a. Please don' t worry, you could try to reformat, just need to back up your data in advance.
b. If the format cannot be completed, you could check the quality of the memory card. Some damaged memory cards cannot be formatted.
c. Maybe the card reader is damaged and need to be returned and replaced after checking the above problem.
For more USB3.0 Card Reader here you go: https://www.alxum.com/collections/card-readers