mfsRamGetFreeSize
Format: s32 mfsRamGetFreeSize(void)
Arguments: None
Return value:Size of free space (a negative value is an error)
Function: Obtains size of free space
Description: This function obtains the size of free space on the disk. It calculates and returns the total block size of all unused blocks, in bytes.
Main errors:
MFS_ERR_NOTMFSDISK Not an MFS-format disk
The disk ID's disk use is not 1, or the header is different.
MFS_ERR_VERSION Different version disk
MFS_ERR_PROTECT Write protected
The medium is volume protected.