Mio C230 comes with 64 MB RAM and by default only 512KB is reserved for storage memory. The storage memory is for system files, it’s kinda like the system drive for your computer. Because of the limitation, you often encounter error messages when you tried to copy stuff to the Windows directory.
You can adjust it by using the Control Panel. Open up FileMan CE and browse to the root directory. Double click on Control Panel.lnk to invoke Control Panel. Scroll down and double click on System. Click on the Memory tab and adjust the storage memory.
Note that you have to do this every time you hard reboot your unit. I’ll try to see if there is a registry trick to adjust the Storage Memory by script.