I found an alternative solution to the formatting of the internal mmc2 memory card. In a Linux:

1.) Connect the N810 to the computer in Linux.
2.) Install Gparted if it is not already installed (to check, terminal "sudo gparted").
3.) Backup your N810's MMC2 internal 2GB flash memory.
4.) Restart the N810 keeping the USB connected to the computer.
5.) Unmount the 2GB MMC2 disk before opening Gparted.
6.) In terminal, or in the XFCE, GNOME, or KDE start menu, open "gparted"
7.) Select the sdb (2 GB MMC2 disk), not your local hard disk.
8.) Delete the partition by right clicking delete in gparted on the computer.
9.) Restart the N810.
10.) On the N810, go to the File Manager (Menu, Utilities, File Manager).
11.) Select the "Internal memory card" and Menu, Tools, Format memory card...
12.) Now you can restore the backup if you wish.

I was unable to format the mmc2 internal memory card by step 11 alone.
Running "mount -o remount,rw /media/mmc2" did allow the write to disk, but not formatting. The above is the only solution I have found to work.