External drive has failed

I have a terabyte external drive that I use for backup with Time Machine. When I restarted my iMac this morning there was a mistake that OSX could not write the disk. It is said that he can still read, but not write (plenty of space on the disk). I tried to run disk first aid on the disk but it completely after about a minute and said: 'first aid process has failed. If it is possible to backup the data on this volume. Click OK to continue. Details on the error message include:

Check the file catalog.

Invalid key length

G volume could not be verified completely

File system check exit code is 8

...

File system check or repair a failure.

Operation failed.

Is there anything else I can do, or the drive is now a paper weight?

It seems that the file system on the external drive is messed up.

(1) you can try a more powerful file system recovery tool.

Perhaps Disk Warrior has the best reputation for this:

http://www.Alsoft.com/DiskWarrior/

(2) you can reformat the drive with disk utility

How old is the drive?  You can think to replace the hd in the case of the external drive.  It is usually a fairly simple process.  Remove the drive encloser to understand what type of connection of the disk is used.

Tags: Mac OS & System Software

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