DosQFSInfo

FSALLOCATE struc
    fsalloc_idFileSystem        dd  ?
    fsalloc_cSectorUnit         dd  ?
    fsalloc_cUnit               dd  ?
    fsalloc_cUnitAvail          dd  ?
    fsalloc_cbSector            dw  ?
FSALLOCATE ends

EXTRN  DosQFSInfo:FAR
INCL_DOSFILEMGR     EQU 1

PUSH   WORD    DriveNumber   ;Drive number
PUSH   WORD    FSInfoLevel   ;File system data required
PUSH@  OTHER   FSInfoBuf     ;File system info buffer (returned)
PUSH   WORD    FSInfoBufSize ;File system info buffer size
CALL   DosQFSInfo

Returns WORD