If this option is selected, the health-related S.M.A.R.T. Other problems may decrease the health value more. With other words, if the value of the "Off line uncorrectable sectors" is high, the health value of the disk cannot be larger than 30 %. For example, if the "Off line uncorrectable sectors" attribute contains 0200 in the "Data" column (which is 512 if converted to decimal value), the heatlh should fall by 512 x 1 = 512 %, but the limit for this attribute is only 70 %. The limit % defines how much % can the attribute decrease the overall health value. The more strict calculation method gives 100 x (100 - 2圆) % x (100 - 5x4) % = 70 % as the resulting health value. If the "Current pending sectors count" attribute has 0005 in the "Data" column also on the same hard disk, the health is = 98 x ( 100 - 5x0.6) % = 95 %. If the "Reallocated sectors count" attribute has 0002 in the "Data" column, the health value = 100 x ( 100 - 2x1 ) % = 98 % The lower 16 bits (righmost 4 digits) are used in the calculation method.įor example: using the default calculation method. These should be converted to decimal before calculation. Note: the Data column contains hexadecimal values. status of (unusable) hard disks received for data recovery. The numbers are determined by examining the arrived reports and the S.M.A.R.T. Off line uncorrectable sectors count 6 60 Weights and limits for the more strict calculation method: S.M.A.R.T. Off line uncorrectable sectors count 1 70 Weights and limits for the default calcuation method: S.M.A.R.T. attributes affecting the health value with their weights and maximum limits:
The following tables contain the health related (critical) S.M.A.R.T. If the more strict, recommended for servers option is used the values are much more strict, the problems may reduce the health much drastically. By using the default method, the weights and limits (see below) are lighter. The overall health percent value is calculated by multiplying the remaining percent values (100 - degradation %).Ĭurrently, Hard Disk Sentinel has two different such methods. These attributes have a pre defined weight and a maximum limit value (the latter defines the maximum degradation in health value for the attribute). parameters (if they are available, it depends on the manufacturer) decrease this value. The hard disk has 100% condition initially. Also an improper sensor should be ignored or its value should be modified (please see temperature calibration about this). For example after replacing a problemmatic power supply, the problems encountered previously should be ignored. The result should be controlled in some situations. The result should be same for two (or more) hard disks with the same problems, even if the hard disks are from different models, manufacturers. More different problems should decrease the result much drastically than only one single problemmatic attribute. It should count the relationship between attributes. Constantly increasing number of problems should constantly decrease the result. It should reflect small changes and degradations. It should not increase with time - do not show the health status better after some time (except if some pending sectors were successfully tested and they can be used because they have no problems). Determine the result without using long time analysing or testing methods. Should not depend on time or past values. When developing the calculation method, the following aspects were important:
attributes) are used to determine hard disk health. If this option is selected, the raw, measured numbers (displayed in the Data column for the corresponding S.M.A.R.T. The differences between these evaluation methods: Analyse data field
It is possible to select many different health (condition) calculation methods at the advanced options. Hard Disk Sentinel Aiuto - Health calculation
0 kommentar(er)
