Updating sd car reader on pc
If your smartphone is SD card-capable, but is having trouble reading your SD card, the card may have been formatted by a device that is incompatible with your phone's operating system.
If you're experiencing this problem, visit your phone manufacturer's website for support.
If this connection is loose, it can cause the card reader not to work properly or at all.
Disconnect the USB connector, restart the computer, and then re-connect the USB connector to the USB port.
If the other memory card is also not readable by the built-in memory card reader, it is a string possibility the memory card reader is not working.
You would need to have an authorized service center look at and repair or replace the memory card reader in your computer.
It is possible the memory card reader is not working properly and not able to read the memory card.You can verify its connection by disconnecting the USB connector and re-connecting it to the USB port.Also, make sure the USB connector is securely connected to card reader as well.To resolve this issue, close all open programs and allow your computer to idle for a few minutes.Plug in the SD card again and see if the drive letter appears.