yes, BlackCardinal, that was the idea.
so if i summarise :
- there is 64MB for RAM (this is to say memory used when you lauch the software, like RAM for a PC..)
- 128MB of flash memory (like a hard drive for PC..).
- And as BlackCardinal said, the 128MB flash sould be splitted with 64MB as ROM (ie flash memory only read, let's say like a CDROM) and 64MB for the user (the usable memory (HD)).
And the ROM (preinstalled software by sharp) sould be in a other partition than the usable memory.
I read in this forum that if you remount the 'rom' rw, then you are able to remove some files from the 'rom' but it does not give you more 'usable memory'.
you can move somes files to the rom (rw this time, so no more realy ROM) to free space in the 'usable memory'.
maybe it is so clear, but i think i have undestood a little bit more. thanks.
result : i need to remount the root in rw, remove unused soft, copy other stuff, remount the root ro.