S.M.A.R.T. information view

S.M.A.R.T. (Self Monitoring, Analysis, and Reporting Technology) is a method for hard drives (and SATA SSDs) to report their health to the host PC.

S.M.A.R.T. data is composed of attributes, each with the following

  • Attribute ID, a number defining the meaning of the attribute
  • Attribute Name, which is the textual description of the attrubute
  • Value (normalized value), ranging from 0 to some maximum (often 100, 200, or 255). The higher the value, the better.
  • Worst, the lowest normalized Value ever recorded over the lifetime of the drive.
  • Threshold. If the Value is below the Threshold, the drive has failed.
  • Raw, or Raw Value, a 64-bit integer from which the firmware derives the normalized Value. Keep in mind that Klennet Recovery shows Raw field in headecimal. There is no uniform specification for the Raw fields, which are vendor-specific. However, as a general rule, if the Attribute Name ends with "Count", the Raw field contains the number of events described by the attribute.

What to watch for

Having other than ideal Spin Retry Count or Calibration Retry Count is very bad. Make an image of the disk immediately.

Having non-zero Raw displayed for Reallocated Sector Count, Reallocation Event Count, Current Pending Sector Count, or Offline Uncorrectable Sector Count is just simlpy bad. It means there are bad sectors on the surface, and the situation tends to deteriorate over time. If you do not want to make an image, then at least keep an eye on the values.