private void PopulateDescription()
{
bool releaseHandle;
SafeFileHandle handle = PhysicalDiskHandlePool.ObtainHandle(m_physicalDiskIndex, FileAccess.Read, ShareMode.ReadWrite, out releaseHandle);
if (!handle.IsInvalid)
{
m_description = PhysicalDiskUtils.GetDeviceDescription(handle);
m_serialNumber = PhysicalDiskUtils.GetDeviceSerialNumber(handle);
if (releaseHandle)
{
PhysicalDiskHandlePool.ReleaseHandle(m_physicalDiskIndex);
}
}
else
{
// we always release invalid handle
PhysicalDiskHandlePool.ReleaseHandle(m_physicalDiskIndex);
// get error code and throw
int errorCode = Marshal.GetLastWin32Error();
string message = String.Format("Can't read from disk {0}", m_physicalDiskIndex);
if (errorCode == (int)Win32Error.ERROR_FILE_NOT_FOUND)
{
throw new DriveNotFoundException(message);
}
else
{
FileStreamEx.ThrowIOError(errorCode, message);
}
}
}
public void WriteSectorsUnbuffered(long sectorIndex, byte[] data)
{
if (data.Length % m_bytesPerSector > 0)
{
throw new IOException("Cannot write partial sectors");
}
if (IsReadOnly)
{
throw new UnauthorizedAccessException("Attempted to perform write on a readonly disk");
}
bool releaseHandle;
SafeFileHandle handle = PhysicalDiskHandlePool.ObtainHandle(m_physicalDiskIndex, FileAccess.ReadWrite, ShareMode.Read, out releaseHandle);
if (!handle.IsInvalid)
{
FileStreamEx stream = new FileStreamEx(handle, FileAccess.Write);
try
{
stream.Seek(sectorIndex * m_bytesPerSector, SeekOrigin.Begin);
stream.Write(data, 0, data.Length);
stream.Flush();
}
finally
{
stream.Close(releaseHandle);
if (releaseHandle)
{
PhysicalDiskHandlePool.ReleaseHandle(m_physicalDiskIndex);
}
}
}
else
{
// we always release invalid handle
PhysicalDiskHandlePool.ReleaseHandle(m_physicalDiskIndex);
// get error code and throw
int errorCode = Marshal.GetLastWin32Error();
string message = String.Format("Can't write to sector {0} of disk {1}", sectorIndex, m_physicalDiskIndex);
FileStreamEx.ThrowIOError(errorCode, message);
}
}
private void PopulateDiskInfo()
{
bool releaseHandle;
SafeFileHandle handle = PhysicalDiskHandlePool.ObtainHandle(m_physicalDiskIndex, FileAccess.Read, ShareMode.ReadWrite, out releaseHandle);
if (!handle.IsInvalid)
{
if (!PhysicalDiskUtils.IsMediaAccesible(handle))
{
throw new DeviceNotReadyException();
}
DISK_GEOMETRY diskGeometry = PhysicalDiskUtils.GetDiskGeometryAndSize(handle, out m_size);
if (releaseHandle)
{
PhysicalDiskHandlePool.ReleaseHandle(m_physicalDiskIndex);
}
m_bytesPerSector = (int)diskGeometry.BytesPerSector;
// CHS:
m_cylinders = diskGeometry.Cylinders;
m_tracksPerCylinder = (int)diskGeometry.TracksPerCylinder;
m_sectorsPerTrack = (int)diskGeometry.SectorsPerTrack;
}
else
{
// we always release invalid handle
PhysicalDiskHandlePool.ReleaseHandle(m_physicalDiskIndex);
// get error code and throw
int errorCode = Marshal.GetLastWin32Error();
string message = String.Format("Can't read from disk {0}", m_physicalDiskIndex);
if (errorCode == (int)Win32Error.ERROR_FILE_NOT_FOUND)
{
throw new DriveNotFoundException(message);
}
else
{
FileStreamEx.ThrowIOError(errorCode, message);
}
}
}
