SOLVED: N810 internal memory card is read only
 

File manager will not let me reformat the card.
"Unable to format. Memory card in use."
Virtual memory (swap?) has been disabled, and a hard reboot, but still the file system is mounted Read only.

Is this fixable, or will I have to re-flash?

Re: N810 internal memory card is read only
 

Have you tried connecting the tablet to a computer via USB and formatting the drive from there?

Re: N810 internal memory card is read only
 

I rebooted again and this time was able to reformat. If at first you don't succeed try, try again.

So...
I had to reboot once before I could disable swap, once after disabling it to verify that it was disabled and twice more before I could format the memory card. I think the last reboot was a soft reboot, but I don't remember, because I was just messing around. I didn't expect it to work, and I was going to do it from my computer when I got home from work. I reformatted using the tool in the file manager.

Re: N810 internal memory card is read only
 

If it ewer happens,here is what i always doo.I remove the virtual memory
take the battery out for about 15 sec.put it back in and the internal Card formats.Works awry time for me...

Re: N810 internal memory card is read only
 

Meh, if that happens I usually just reboot with the USB connected, and let it automount the drives before Maemo can get ahold of them. Then I just format and all is good. :)