FILE_ALIGNMENT_INFORMATION - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTIOAPI_H

/**
 * The FILE_ALIGNMENT_INFORMATION structure is used to query or set the buffer alignment required by the underlying device.
 * \sa https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddk/ns-ntddk-_file_alignment_information
 */
typedef struct _FILE_ALIGNMENT_INFORMATION
{
    ULONG AlignmentRequirement;
} FILE_ALIGNMENT_INFORMATION, *PFILE_ALIGNMENT_INFORMATION;

#endif

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This structure is documented in Windows Driver Kit.