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AX = 7303h
DS:DX -> ASCIZ string for drive ("C:\" or "\\SERVER\Share")
ES:DI -> buffer for extended free space structure (see #01789)
CX = length of buffer for extended free space
Return:
CF clear if successful
ES:DI buffer filled
CF set on error
AX = error code
Notes: On DOS versions which do not support the FAT32 calls, this function returns CF clear/AL=00h (which is the DOS v1+ method for reporting unimplemented functions). Under DOS 7.x (i.e. "MSDOS Mode" under Windows95), the ASCIZ string pointed at by DS:DX *must* include the drive letter, or this function will return CF set/AX=0015h (invalid drive). In a DOS box, omitting the drive letter (DS:DX -> "\") results in the free space for the current default drive, as expected
BUG: This function returns a maximum of 2GB free space even on an FAT32 partition larger than 2GB under some versions of Win95 and Win98, apparently by limiting the number of reported free clusters to no more than 64K -- but only in a DOS window if a TSR has hooked INT 21h
See Also: AX=7302h - AX=7304h - AX=7305h - AH=36h
Format of extended free space structure: Offset Size Description (Table 01789) 00h WORD (ret) size of returned structure 02h WORD (call) structure version (0000h) (ret) actual structure version (0000h) 04h DWORD number of sectors per cluster (with adjustment for compression) 08h DWORD number of bytes per sector 0Ch DWORD number of available clusters 10h DWORD total number of clusters on the drive 14h DWORD number of physical sectors available on the drive, without adjustment for compression 18h DWORD total number of physical sectors on the drive, without adjustment for compression 1Ch DWORD number of available allocation units, without adjustment for compression 20h DWORD total allocation units, without adjustment for compression 24h 8 BYTEs reserved
Category: DOS Kernel - Int 21h - W
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