I am using a ReadyNAS 1100 and have had to replace the disk in slot 3 4 times over the past 1.5 years. The other disks have been perfect.
Disk 1 Power on hours: 26538
Disk 2 Power on hours: 26538
Disk 3 Power on hours: 1247
Disk 4 Power on hours: 7767
I could live with it for the first or second but 4 indicates problems to me.
Any idea what I should do to debug the issue or is it the case that the NAS is broken?