public static extern Boolean DeviceIoControl(
SafeFileHandle hDevice,
uint dwIoControlCode,
ref STORAGE_PROPERTY_QUERY InBuffer,
int nInBufferSize,
ref STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR OutBuffer,
int nOutBufferSize,
ref int pBytesReturned,
IntPtr lpOverlapped);
public StorageAccessAlignment GetAlignment(SafeHandle hDevice)
{
StorageAccessAlignment alignment = new StorageAccessAlignment();
SafeAllocHandle <STORAGE_PROPERTY_QUERY> storagePropertyQueryPtr = null;
SafeAllocHandle <STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR> storageAlignmentPtr = null;
try {
STORAGE_PROPERTY_QUERY storagePropertyQuery = new STORAGE_PROPERTY_QUERY {
PropertyId = (uint)STORAGE_PROPERTY_ID.StorageAccessAlignmentProperty,
QueryType = (uint)STORAGE_QUERY_TYPE.PropertyStandardQuery
};
storagePropertyQueryPtr = new SafeAllocHandle <STORAGE_PROPERTY_QUERY>(storagePropertyQuery);
storageAlignmentPtr = new SafeAllocHandle <STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR>();
bool success = DeviceIoControl(hDevice, IOCTL_STORAGE_QUERY_PROPERTY,
storagePropertyQueryPtr, storagePropertyQueryPtr.SizeOf,
storageAlignmentPtr, storageAlignmentPtr.SizeOf,
out uint bytesReturns, IntPtr.Zero);
if (!success || bytesReturns == 0)
{
// Windows XP returns success, byte bytesReturns == 0.
m_Win32Error = Marshal.GetLastWin32Error();
return(null);
}
STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR storageAlignment = storageAlignmentPtr.ToStructure();
alignment.BytesPerCacheLine = (int)storageAlignment.BytesPerCacheLine;
alignment.BytesOffsetForCacheAlignment = (int)storageAlignment.BytesOffsetForCacheAlignment;
alignment.BytesPerLogicalSector = (int)storageAlignment.BytesPerLogicalSector;
alignment.BytesPerPhysicalSector = (int)storageAlignment.BytesPerPhysicalSector;
alignment.BytesOffsetForSectorAlignment = (int)storageAlignment.BytesOffsetForSectorAlignment;
} finally {
if (storagePropertyQueryPtr != null)
{
storagePropertyQueryPtr.Close();
}
if (storageAlignmentPtr != null)
{
storageAlignmentPtr.Close();
}
}
return(alignment);
}
public UInt32 GetPhysicalSectors(string drive)
{
short FILE_ATTRIBUTE_NORMAL = 0x80;
short INVALID_HANDLE_VALUE = -1;
uint GENERIC_READ = 0x80000000;
uint GENERIC_WRITE = 0x40000000;
uint CREATE_NEW = 1;
uint CREATE_ALWAYS = 2;
uint OPEN_EXISTING = 3;
SafeFileHandle handleValue = CreateFile(drive, GENERIC_READ, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
if (handleValue.IsInvalid)
{
//Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
return(0);
}
uint IOCTL_STORAGE_QUERY_PROPERTY = 0x002d1400;
STORAGE_PROPERTY_QUERY storageQuery = new STORAGE_PROPERTY_QUERY();
storageQuery.PropertyId = STORAGE_PROPERTY_QUERY.STORAGE_PROPERTY_ID.StorageAccessAlignmentProperty;
storageQuery.QueryType = STORAGE_PROPERTY_QUERY.STORAGE_QUERY_TYPE.PropertyStandardQuery;
STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR diskAlignment = new STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR();
Int32 read = 0;
if (DeviceIoControl(handleValue, IOCTL_STORAGE_QUERY_PROPERTY, ref storageQuery, Marshal.SizeOf(storageQuery), ref diskAlignment, Marshal.SizeOf(diskAlignment), ref read, IntPtr.Zero))
{
handleValue.Close();
return(diskAlignment.BytesPerPhysicalSector);
}
else
{
handleValue.Close();
return(0);
}
}
