Mac error code 8065 can frustrate any Mac user who is trying to perform a copy paste operation on any file or folder in the drive. This case occurs more often when you are using an external drive and it is not connected well or is corrupted. You should check the connection and see if the copy paste is working or not. If you are getting the mac error code 8065 problem while using the internal drive then it is because of the corruption of the drive. You can use the disk utility that is provided in the Mac system to detect any kind of dis-functionality in the drive whether it is internal or external. It may find the cause but it is not necessary that it will fix mac error code 8065. So you may have to format the drive but you should know that by doing this the data will be lost from the drive. Now if you want it back use the time machine backup or the Mac data recovery software which can make the compete recover of all the data that has been lost from the time machine. Download the software now and recover Mac data.