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EliteRAID ER104CT
User Guide
1.4.3 Smart Fan
The smart fan automatically regulates the fan speed according to the internal temperature.
It will start using low speed from 45 degrees, increase the speed every 5 degrees until 60
degrees and then use full speed above 61 degrees Celsius.
1.4.4 Buzzer
When the jumper on pin J10 is removed, the buzzer will sound an alarm when the fan fails.
1.5 RAID Modes
The difference in performance is only visible for fast interfaces like eSATA. Depending on
the RAID mode, only a certain amount of drives can be used (see RAID selector switch).
1.5.1 Disk Spanning
The drives show up as one large single volume but the total size will depend on the drive
with the smallest capacity. Spanning is an array (not RAID) that is written sequentially
across the drives. By itself, it does not provide any performance or redundancy benefits.
1.5.2 Disk Striping (RAID 0)
The drives show up as one large single volume but the total size will depend on the drive
with the smallest capacity. Used where speed is the primary objective but RAID Level 0
(also called striping) is not redundant. This form of array splits each piece of data across
the drives in segments; since data is written without any form of parity data-checking, it
allows for the fastest data transfer of all other modes. However, if one drive becomes
damaged, the whole array can become corrupted.
1.5.3 Disk Mirroring (RAID 1)
The drives show up as one volume but only 50% of the total capacity, depending on the
drive with the smallest capacity, can be used. RAID 1 creates an exact copy (or mirror) of
a set of data on the second drive. This is useful when reliability and backup are more
important than data capacity. When one hard drive fails, it can be replaced and the data
rebuilt automatically.
Page 3 / Chapter 1 - Introduction
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