The received reports help in further development and it is possible that in a later version the exact power on time count will be displayed from the first time (without the need of the measurement). When the measurement completed, it is recommended to send a test report. If the displayed value seems to be incorrect (too low or high), the "Repeat Test" button can be used. This measurement has no effect on the performance of the hard disk or the computer.Īfter the measurement (or if it is not required) the exact, accurate power on time value is displayed (with black color) and the "estimated value" text is not displayed. After successful measure, the unit is saved and it will be used automatically later. If the user closes the application during the test, it will be automatically restarted on the next launch of Hard Disk Sentinel until it can determine the unit of time used on all hard disks. During this test, an estimated power on time value is displayed (with grey color) and it may not be accurate. It checks the elapsed time between two consecutive increases of the raw value of this attribute. Different units are also possible and two hard disks from the same manufacturer may not have same time units.Īfter installation, Hard Disk Sentinel starts examining this attribute. It can be hours (the value is increased once per every hour), minutes or half-minutes. The unit of the time depends on the manufacturer. The raw value of this attribute is constantly increasing when the hard disk is under power (running, but not neccessarily performing a read or write operation). This value is supported by most modern IDE and S-ATA hard disks. Hard disk power on time can be determined by examining the #9 "Power on time count" S.M.A.R.T.
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