Windows only: Free utility HDDScan diagnoses whatever ails your hard drive. HDDScan works on ATA, SATA, and SCSI drives and (with some limitations) on removable drives such as USB and FireWire. Analyse drive temperatures, conduct S.M.A.R.T. tests, export and print reports to document changes in your hard drive's health with HDDScan, which is a free download for Windows only.

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