The best replacement for scandisk is chkdsk.

The best alternatives to scandisk are rated as following:
★★★★★  chkdsk
★★★  defrag first
★  defrag
★  checkdisk
  lexar
  sandisk
  chkdisk

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Speaking about scandisk, one probably shouldn't forget about windows 98.

Other search terms related to scandisk and their ratings are:
★★★★★ windows 98
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Google Trends

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scandisk
chkdsk
defrag first