Needing to run fsck -fy "often" should I send to repair? Every month I usually give a go to Onyx so I repair all permissions and such. Every time I do that, I get that I need to repair the Disk and I end up having to boot with the single user (in which I see a hint of an error but goes quickly) and then use the fsck -fy command. After a couple of runs it gets solved and everything seems ok. 

However, I'm a bit afraid that the disk goes off some day. Any experience with this?
First wipe the drive entirely. Repartition and then give it one more chance. Unless you want to blame a corrupt OS or really bad programs, this is likely a failing drive and not bad data or bad OS.