You have between 0% and 5% that what Disk Utility says about your hard drive is wrong. The other 95% is that your hard drive might be dying. Now to calm you, the alarm will pop up when it detects a problem with the SMART (ANY of the many problems a hard drive can have with it...even little ones like some cluster/sector/block has something bad).
My example is 2 Hard drives that in Ubuntu 10.04 one of them happen to have some horrible problems and the alarm came out EVERY SINGLE TIME Ubuntu booted. In Ubuntu 10.10 the problem went away since Disk Utility had a problem with some 1TB HDDs. It was solved, but since this is a software that checks for SMART data, this does not give 100% guarantee that your hard drive is bad, dying or damaged. You can click on the Hard Drive and then click the SMART Data button. That should mention the type of problem you have and how many bad sectors you have.
NOTE: If you have around 500 bad sectors, I suggest you start checking for a new hard drive. If you have like 2000 to 5000 sectors I REALLY suggest you get up from your chair, run to the nearest PC Vendor and buy a Hard Drive... quickly!.
Now for your answer.
- Open the Disk utility. (On 11.10 or 11.04 using Unity press SUPER and type disk utility). For 12.04, 12.10 and up simply type
- Click on the Hard Drive that has the problem
- Click on the SMART Data Button (On 12.04+ look for an icon that shows advanced options. The SMART options should be there).
- On the lower left corner of the SMART Data window click on Don't warn if the disk is failing
Some Images to help you:
Disk Utility Opened - Selecting the Failing Disk
Selecting SMART Data Button
Clicking on the Don't warn if the disk is failing
After this, everytime you boot you will not get a warning for THAT Hard Drive.
For my experience i would stay away from some Seagates (NOT ALL. The Barracuda ones rock on) and REALLY and Specially from all Western Digital Caviar Models. Am sorry to say but no matter how they paint them, they suck. They have the highest overall of failure for all drives in history. I have seen more Caviar fail to heat, time powered on and heavy copy than any other drives. I was a Quantum follower, then a Maxtor follower (For obvious "bought quantum" reasons and now a Seagate follower. Although i read a lot Toms Hardware and have found out that Samsung and Hitachi are getting REALLY good.
In 12.10+ the message does not appear by default, so the need to disable it is not needed.