What will you do when the western digital my book hard drive not recognized on Mac ? This particular external hard drive is a good choice to expand the storage of your Mac. The external hard drives often create problems while mounting and this too is no exception. However western digital my book hard drive not recognized rarely happens with these drives but when it does you won't be able to access the files for the drive. The reason behind it can be the corruption which occurs due to abrupt disconnection of the drive from the system, copying a malicious file in the drive, there was some error while doing the partition, the file system got damaged etc. The only way to fix western digital my book hard drive not recognized problem is to format the drive. However this also remove the data from the drive. You can restore data lost data from any backup source. But when the backup is not available then you can use the Mac data recovery software which is able to perform a through scan of the drive. When the scanning is complete you get a list of file in the preview window which can be selected for recovery. So download the software now to recover data after western digital my book hard drive not recognized issue is resolved.