Linux usb does not recognize the solution

After inserting the USB flash drive, follow the steps below:

1.fdisk -l /dev/sd*

Usually this step will find the USB flash drive. If the U disk has an indicator light, it will be displayed.

2. If the previous command does not respond, or some information display module is not added, you can check if there is a usb-storage scsi_mod sd_mod module.

No modprobe [module], add missing modules, and then try again ok.

3. Finally, mount the U disk. Here you need to create a usb directory under the mnt directory.

mount /dev/sda /mnt/usb

The system needs to specify the type of file system, you can use

mount -t vfat /dev/sda /mnt/usb