h6. [[OS SWI Calls]] h6(. » [[OS_FSControl]] h6((. » OS_FSControl 55 h2. OS_ FSControl 55 h5. (SWI &29) |_<^{width:4em}. Entry | | |<^. R0 |<^. 55 (&37) | |<^. R1 |<^. Pointer to name of object| |_<^{width:4em}. Exit | | |<^. R0|<^. Least significant word of free space | |<^. R1|<^. Most significant word of free space | |<^. R2|<^. Size of largest object that can be created | |<^. R3|<^. Least significant word of disc size | |<^. R4|<^. Most significant word of disc size | h4. Use The purpose of this call is to reads the free space on a *large* disc or image file that holds a specified object. h4. Notes This call is only implemented in RISC OS 3.60 and later - if an error is returned try [[OS_FSControl 49]] for the prior implementation. 'Large' disc needs to be defined. h4. See also * [[OS_FSControl]] * [[OS_FSControl 49]]