MicroSD Card Fails to Mount

I am trying to debug a problem with my Micro SD card… I have a Pixhawk with the microSD card inserted properly. From the nuttx shell, I first try to format the card with:
nsh> mkfatfs mmcsd0
nsh: mkfatfs: mkfatfs failed: File table overflow

If I try to mount the SD card…
nsh>mount -t vfat /dev/mmcsd0 /fs/microsd
nsh: mount: mount failed: Connection timed out

Any thoughts on what is going on?

Hey Mike,
Any chance you figured out what was wrong?
I am currently running into the same issue.