Disk is reported as Healthy, but obviously isn't by the number of bad sectors, read/write fails etc.

[David Colebatch]

Overall Assessment: Disk is healthy
Read Error Rate:
  Normalized: 92
  Worst: 90
  Threshold: 50
  Value: 511162882722 <---- WTF?

Reported Uncorrectable Errors:
  Normalized: 1
  Worst: 1
  Value: 1980 sectors

Hardware ECC Recovered:
  Normalized: 102
  Worst: 99
  Value: 43011447458 <-- My god...

Uncorrectable ECC Errors:
  Value: 448 sectors

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Now, running the extended self-check never completes. It says it was canceled by either soft/hard reset about 2min in.

So, is this disk healthy? The system crashes all the time when I boot off it!A

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: gnome-disk-utility 2.32.1-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Mon Aug 1 01:35:28 2011
ExecutablePath: /usr/bin/palimpsest
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-disk-utility
UpgradeStatus: No upgrade log present (probably fresh install)
XsessionErrors:
 (<unknown>:4763): dee-WARNING **: Transaction from com.canonical.Unity.ApplicationsPlace.SectionsModel is in the past. Ignoring transaction.
 (<unknown>:4763): dee-WARNING **: Transaction from com.canonical.Unity.ApplicationsPlace.RunnerGroupsModel is in the past. Ignoring transaction.