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

//  If set, this operation will write the data for the given file from the
//  Windows in-memory cache.  It will also try to skip updating the timestamp
//  as much as possible.  This will send a SYNC to the storage device to flush its
//  cache.  Not supported on volume or directory handles.
#define FLUSH_FLAGS_FLUSH_AND_PURGE 0x00000008 // 24H2


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