Arduino Yun Disk Expander low memory but it looks like my memory is fine

I can't quite understand this when I run arduino yun disk expander sketch with a sd card plugged in I get the the following message. You do not have enough flash memory need 1mb. I ssh into my arduino and I get this

Filesystem Size Used Available Use% Mounted on
rootfs 6.9M 632.0K 6.3M 9% /
/dev/root 7.5M 7.5M 0 100% /rom
tmpfs 29.8M 148.0K 29.7M 0% /tmp
tmpfs 512.0K 0 512.0K 0% /dev
/dev/mtdblock3 6.9M 632.0K 6.3M 9% /overlay
overlayfs:/overlay 6.9M 632.0K 6.3M 9% /
/dev/sda1 29.7G 2.4M 29.7G 0% /mnt/sda1

The only thing that is full is the /dev/root but the reading I have done through the posts here and online say that's fine. Why may this be I am quite confused???