My brother, who is new to macs, has an iMac and an external LaCie drive. He's been (unbeknownst to me) shutting off the HDD without dismounting it first, and also has an iffy power supply to his flat, and something has gone wrong beyond SL's power to correct it - Disk Utility is coming up with a mount failure alert, citing corrupted journal when we run Repair Disk.
Does anyone know whether this is a small or a large disaster? Is it something that e.g. Disk Warrior is likely to be able to repair?
_________________________ If it's brokenless, don't suffix it...
But sometimes, journal can itself become corrupt due to issues like unexpected shutdown or hardware problems. In such cases, when Mac system replays journal log entries, it marks invalid entries in the file system and all metadata structure becomes invalid. Thus, file system gets damaged and data becomes inaccessible. In some cases, system may fail to boot.
To recover file system and hence data, the following steps can be taken:
• You can use fsck command to repair corruption issues with HFS+ or HFSX file system. This command tool can repair most of the file system issues.
• If problem continues to occur, format the disk using Disk Utility and use your recent data backup to restore data from. Formatting the disk recreates the file system and refreshes all metadata information.
• If data backup is unavailable, incomplete or damaged, you can use third party Data Recovery Mac applications to recover data.
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