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Format of extended free space structure

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Offset Size Description

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