If you are using an external hard drive with your Mac system then there are chances that you encounter Mac 50 error. The error is shown when you try to transfer the data from one drive to another and sometimes this problem also occurs with internal volumes of the Mac drive. The Mac 50 error can be caused when you do not have the permission to copy or move the files, the volume to which you are transferring the file is not properly mounted and in some cases it may also get corrupted. You can use the disk utility application of Mac for scanning of the drive and fix the corruption issue and reconnect the drive and check for the permission settings. If you can not fix Mac 50 error then you have to format the drive then after use the time machine to recover all your data. But if the time machine does not work then you can use the Mac data recovery software which can perform a thorough scan of the drive and then show the results in the preview. You just have to choose and recover the files, it is as simple as that so you should download the software now.