I have a Lacie 500GB external drive I have been using for my Time Machine Backups.
Suddenly it fails to backup - saying there is a problem with the disc.
I repair the disk and all is ok for a day when the same happens again on Time Machine backup.
The repair fails this time so I spend 20 hours writing 'zero' to the disc.
I then run 'verify' and it says all is ok.
I then try Time machine again - same result as before - again if fails to backup.
I run ' repair : on 'verify' I get "invalid node structure", and currently is is repairing (very slowly for an empty drive - it estimates 2 mins but has been going for at least 15) .
Is it time to admit defeat and get a new drive?