I ran a level 4 maintenance level on my hard drive with SpinRite. Everything was clean, but I checked the log and it said that it found ~2,000,000 seek errors. That's the only thing that SpinRite found. Is that something to worry about?
This sounds like it might be a S.M.A.R.T. value, if so, then this is not an actual decimal number, it is a raw value and its actual value is dependent on the drive manufacturer.
See Wikipedia for more info.
Run a S.M.A.R.T. monitoring tool from inside an OS and see what that says.