Many of the Mac users have complained that he noticed Mac os x lion error code 50, while transferring some files from one location to another location or to an external hard disk. Basically it is well known as a file transfer error. The Mac os x is the best operating system that is providing very interactive interlace but on the other side, sometimes it shows an error message “The operations can't be completed because an unexpected error occurred (error code-50)”. Usually this Mac os x lion error code 50 occurred at the time of copy, delete or move an file from system to an external hard drive. The reason behind the Mac os x lion error code 50 are Mac header header file corruption, attack of virus, human mistake, boot sector problem in Mac, Kernel panic issue, sharing files on unsupported files etc. You need to aware the fact that the Mac os x lion error code 50 may causes loss of stored data from the Mac volumes. So if this happens to you and even the backup is not available to you then immediately take help of Mac data recovery software. This software can be used in all versions OS of Mac.