50g

>   So, to avoid DISK FULL errors, compact your data into really big 
objects  or use multiple SD cards.  It'll mean somewhat longer 
processing time but will result in no surprises.  

Or, if your card is smaller than 2GB, reformat it with a smaller 
cluster size (be sure to back up your card first). Most of your 
objects are probably much smaller than 32K, but they're occupying 
32K, leaving all that empty, unused, unusable space.

Before formating, you might want to run CHKDSK on the card first, 
just to see how bad the clustering is making it.

kiy