我很难理解这个概念:我有一个固定大小的定义:(来自http://msdn.microsoft.com/pt-br/library/aa931918.aspx)typedefstruct_FlashRegion{REGION_TYPEregionType;DWORDdwStartPhysBlock;DWORDdwNumPhysBlocks;DWORDdwNumLogicalBlocks;DWORDdwSectorsPerBlock;DWORDdwBytesPerBlock;DWORDdwCompactBlocks;}FlashRegion,*PFlashRegion;这个FlashReg