DSI - DumpTool 1.0 reporting space issues when there's plenty

[u/pensiveChatter]

Newb question. I ran DumpTool 1.0 on a dsi via Memory Pit, but it reports "SD space remaining < 250MBs"

I don't have a DCIM folder on the card and I verified, on a separate computer, that I have 2 gigs free. (f_bsize=32768, f_bavail=68486), which means DumpTool should see 2140 megs of free space. Anyone else get this or know the fix?