If you are using the hitachi external drive with your Mac system then you must be storing large and important files in it. In case you find some files missing from the drive then you will need to recover lost files from Hitachi hard disks. The files are generally lost due to accidental deletion, when you disconnect the drive abruptly from the system then either some of the file or the whole drive will get corrupted. There is also a possibility that the drive is infected by virus. You can use the disk utility to repair the drive but finally you may have to format the drive. Then after you can recover lost files from Hitachi hard disks from any backup source. If the backup is not available then you can use the Mac data recovery software and then connect the drive to scan it for the lost files. You will then receive the list of files in the preview window. You can then select the files you need to restore and then recover lost files from Hitachi hard disks with ease. So you can download the software and perform the recovery now.