Thecus N2800 User Manual page 135

You may also perform a disk SMART test (doesn't apply to SAS HDD); simply click
"Test" to start the SMART test. The result is only for reference and the system will
not take any action from its results.
S.M.A.R.T. Information
Item
Tray Number
Model
Power ON Hours
Temperature Celsius
Reallocated Sector
Count
Description
Tray the hard disk is installed in.
Model name of the installed hard disk.
Count of hours in power-on state. The raw value of this attribute
shows total count of hours (or minutes, or seconds, depending on
manufacturer) in power-on state.
The current temperature of the hard disk in degrees Celsius.
Count of reallocated sectors. When the hard drive finds a
read/write/verification error, it marks this sector as "reallocated"
and transfers data to a special reserved area (spare area).
This process is also known as remapping and "reallocated"
sectors are called remaps. This is why, on a modern hard disks,
you cannot see "bad blocks" while testing the surface - all bad
blocks are hidden in reallocated sectors. However, the more
sectors that are reallocated, the more a decrease (up to 10% or
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