I have a Dell Inspiron 1501 running Windows XP and on start up I receive a message stating SMART Failure Predicted on Hard Disk 4: WDC WD600BEVS-75LAT0-(S1)
To echo @Zypher and @squillman, When you see this message, you should replace the hard disk, not turn the alarm off. This is akin to turning the monitors attached to ICU patients simply because they are annoyingly beeping.
However, it is possible to turn it off in many cases (but do not do this unless you know what you are doing): turn off SMART support in the BIOS: This will stop it from complaining that there is imminent failure of harddrive. Note that this also stop SMART from telling you that other drive are failing in case they are. I repeat, don't do this unless you know what you are doing.
I am not sure, though, if the BIOS in inspiron contain such an option. This option is available in most desktop systems using e.g. Gigabyte/MSI/etc motherboards.
The problem is more than likely that the harddrive was replaced or formatted, and no longer contains the Dell "Recovery" partition... this information started showing up for me after replacing my drive that failed (and oddly enough NEVER showed up before my drive failed) there doesn't seem to be anyway at all to disable it.. or do anything of any real consequence in the DEll bios... i'm hunting down a hacked bios to get rid of this message if i can find it and will hack it myself if not.
but this is NOT a true "SMART for hard disks" message... it occurs whenever you replace your harddrive yourself without going through dell.. or delete the recovery partition on a inspiron 1501 laptop. I have no doubt that there is a similar message if it detects your harddrive is failing.. but dell ghosted a message to be annoying as well if you do harddrive modifications on your own...