File System Corruption in External Mac Hard Drive

Sometimes when you unplugged your external hard drive without any proper shutdown, next day you start again plugging you external drive it would not be recognized and your Mac can not read data from external drive. You tried to fix it by using another USB, Checking the preferences or setting PRAM.

Unplugging or powering down the system when it was in a running condition may corrupt the file directory and eventually data loss may happen. The problem could be worse when you do not have a complete backup of your data or an improper backup which leads into the lost of your important files, documents, pictures and videos.

Using Disk Utility which is an inbuilt utility in Mac can help you by repairing the permissions and rebuilding the file data structure. However most of the time when the file got corrupted or damaged it becomes impossible for disk utility to repair the files.

This problem occurs due to affected system metadata structure, hard drive profiles, system files and library files. This situation may also occur due to node structure corruption or file system corruption. Also the problem could be due to the disk data structure corruption and thus Mac Recovery is required to scan the drive and extract all of the data from it.

Always Backup via Time Machine or Clone your Drive to avoid any data loss circumstances. Another option is to reformat your hard drive which means erasing your all data which is not preferred resolution. Try using a Mac data recovery tool which could atleast help you to recover your data before any disk initialization. You need to keep a second hard drive as a destination drive to save your recovered files which acts as a backup in future

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When you encounter the Error - “No such volume; volume not found”

A hard drive in Mac Operating System based computer is divided into various partitions to make the OS perform more efficiently. These different partitions/volumes can be used for storing different kinds of data in the drive. However, sometimes when you try to access one of the drives, you fail to access it, following some error message on the screen.

The error message stating no such drive exists may sound surprising to you, but it happens because of the fact that the disk drive has been damaged and inaccessible. This condition leads to a serious instance of data inaccessibility and you badly need specific recovery software to get your precious data back.

One error message that depicts such a scenario as mentioned above is -

“No such volume; volume not found”

After encountering such an error, you may find yourself in a helpless state. All the data in the hard drive remains completely inaccessible and you must have a valid backup to resume your work back to normalcy.

The above mentioned error occurs due to a possible damage in the hard drive structure. In Mac Disk Utility is an inbuilt repairing tool that detects and repairs hard drive errors. Here, when you run Disk Utility, you get another error message as below:

“Error starting disk utility back ground process”

Another error message that follows the previous one may be:

“Disk Utility started, but a background process needed in disk utility didn't start properly. Please quit and restart disk utility.”

These error messages are the outcome of a serious damage to the hard drive volume or its file system. This may happen due to several reasons like, abrupt system shutdown, operating system malfunction, virus/malware attack etc. Whatever be the reason, the only solution to this issue is to format the hard drive and install a fresh copy of the Mac OS X.

This of course leads to complete erasing of data from the drive and a Mac undelete files software can help you recover all your formatted data back. These specially designed software help you to undelete mac files from any HFS plus, HFS, HFS wrapper and FAT file system based volumes. With these useful utilities, you can recover your data from any Mac OS X based media, including external/internal hard drive, USB drive, memory cards etc.