Are you getting 1407 error on your Mac ? The error generally occurs when you try to copy or move the file from any external drive. This can be because of the permission settings so first make all the settings to default. If the settings are okay then check the connection cable and try to reconnect it properly. Sometimes there is the mounting problem the drive was not mounted on the Mac system. If you have checked all the problem then the chance is that the drive has been corrupted. The corruption can be caused if the drive was disconnected abruptly. Any type of virus infection, file system error, bad sector issue can also cause the corruption. To deal with the corruption and fix 1407 error you have to format the drive. This will remove the cause of corruption but in the process it will also erase all the files from the drive. Now when you have fixed the 1407 error you can restore all the files if you have the backup of them. If the backup is not there you are free to use the Mac data recovery software. The software has a strong algorithm to scan the drive and restore all the files with ease.