HDD S.M.A.R.T. extension controls the health status of your hard disks. It can discover a probable hard disk drive (HDD) fail before it actually occurs. HDD S.M.A.R.T. extension uses S.M.A.R.T. technology, included in all modern hard disks.
S.M.A.R.T. is a self-testing and monitoring performed by some HDD. It looks like the HDD is continuously making self-tests and calculating some "attributes", which reflect the current state of efficiency and status of the HDD.
Each attribute means some detail in HDD status – total hours of work, count of read errors, and others. If after a self-test, the HDD "thinks" that its state is changed, it changes the value of the corresponding attribute. For example, if the time of spin-up from idle state changed, the HDD would change (lower) the value of the "Spin-Up Time" attribute.
Each attribute has a threshold (lower) value and, at achievement, the HDD may stop working. HDD S.M.A.R.T. extension monitors attribute changes and reports the changed values.
Network File Monitor Professional has an ability to extend its functionality by the additional modules like HDD S.M.A.R.T. extension.