#mount /dev/sd1a /mnt/usb
mount_ffs: /dev/sd1a on /mnt/usb: Device not configured
#mount /dev/sd1i /mnt/usb
Succeed! Don’t know why, it is /dev/sd1i
#disklabel -E sd1 can look into the disk info
#mount /dev/sd1a /mnt/usb
mount_ffs: /dev/sd1a on /mnt/usb: Device not configured
#mount /dev/sd1i /mnt/usb
Succeed! Don’t know why, it is /dev/sd1i
#disklabel -E sd1 can look into the disk info
worked for me too thank you