[ubuntu] DISK HAS MANY BAD SECTORS ... help?

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http://ubuntuforums.org – So after upgrading to Karmic, I have this handy little drive assessment tool telling me in large red letters that my laptop (IBM Thinkpad T43p, 3.4 years old) has a hard disk with crutches and a terrible limp. My friend who is more experienced in such matters than I has advised me to ask here if anyone knows of a program that can help me further diagnose the extent of the problem and possibly fix it - in case it is merely the result of corrupted data. Otherwise, I am prepared to replace the disk, and I would appreciate any suggestions on buying a new HD for a T43p thinkpad. (Hardware)