Got problem about MySQL: .MYD' not found (Errcode: 2)

After half an year working perfectly, this morning I found one of my database stopped to response. After checking the error, I found following error

{MySql.Data.MySqlClient.MySqlException (0x80004005): File '.xxxxx.MYD' not found (Errcode: 2)
   at MySql.Data.MySqlClient.MySqlStream.OpenPacket()
   at MySql.Data.MySqlClient.NativeDriver.ReadResult(UInt64& affectedRows, Int64& lastInsertId)
   at MySql.Data.MySqlClient.MySqlDataReader.GetResultSet()
   at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader()
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()
   at CWShared.NDMySql.SetSellerCrawlTime(Int32 iProductSN, Int32 iSellerSN, DateTime dLastUpdate)}

After searching a little bit, the following page provides the answer:

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