Thecus 1U4500S Leaflet

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S.M.A.R.T. Information 
Item Description 
Tray Number 
Tray the hard disk is installed in. 
Model 
Model name of the installed hard disk. 
Power ON Hours 
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. 
Temperature Celsius 
The current temperature of the hard disk in degrees Celsius 
Reallocated Sector 
Count 
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 can not 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 
more) can be noticed in disk read/write speeds. 
Current Pending 
Sector 
Current count of unstable sectors (waiting for remapping). The 
raw value of this attribute indicates the total number of sectors 
waiting for remapping. Later, when some of these sectors are 
read successfully, the value is decreased. If errors still occur 
when reading sectors, the hard drive will try to restore the data, 
transfer it to the reserved disk area (spare area), and mark this 
sector as remapped. If this attribute value remains at zero, it 
indicates that the quality of the corresponding surface area is 
low. 
Raw Read Error Rate 
This attribute value depends on read errors and disk surface 
condition, and indicates the rate of hardware read errors that 
occurred when reading data from a disk surface. Lower values 
indicate that there is a problem with either the disk surface or 
the read/write heads. 
Seek Error Rate 
Rate of seek errors by the magnetic heads. If there is a failure 
in the mechanical positioning system, servo damage or a 
thermal widening of the hard disk, seek errors arise. More seek 
errors indicates a worsening condition of a disk surface and the 
disk mechanical subsystem. 
Back Press 
Back to go back to the Disks Information screen. 
 
NOTE 
If the Reallocated Sector Count or Current Pending Sector of a hard 
disk drive is not zero, the status of the disk will show “Warning”. This 
warning is only used to alert the system administrator that there are 
bad sectors on the disk, and they should replace those disks as soon as 
possible. 
 
 
 
RAID Information 
From the Storage menu, choose the RAID 
item and the RAID List screen appears.  
 
This screen lists the RAID volumes currently 
residing on the 1U4500. From this screen, 
you can get information about the status of 
your RAID volumes, as well as the 
capacities allocated for data, USB target, 
and iSCSI. There is also a graph which 
represents how the RAID volume is 
currently allocated. 
 
 
 
 
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