public DiskStream(Session session, long lun, FileAccess access)
{
_session = session;
_lun = lun;
LunCapacity capacity = session.GetCapacity(lun);
_blockSize = capacity.BlockSize;
_length = capacity.LogicalBlockCount * capacity.BlockSize;
_canWrite = access != FileAccess.Read;
_canRead = access != FileAccess.Write;
}