#ifndef _NTIOAPI_H
typedef struct _FILE_FS_SECTOR_SIZE_INFORMATION
{
ULONG LogicalBytesPerSector;
ULONG PhysicalBytesPerSectorForAtomicity;
ULONG PhysicalBytesPerSectorForPerformance;
ULONG FileSystemEffectivePhysicalBytesPerSectorForAtomicity;
ULONG Flags; // SSINFO_FLAGS_*
ULONG ByteOffsetForSectorAlignment;
ULONG ByteOffsetForPartitionAlignment;
} FILE_FS_SECTOR_SIZE_INFORMATION, *PFILE_FS_SECTOR_SIZE_INFORMATION;
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This structure is documented in Windows Driver Kit.