Addonics Technologies Computer Drive AERD25SN35 User Manual

T E C H N O L O G I E S  
User Guide  
Snap-In 25 RAID  
(AERD25SN35)  
Technical Support  
If you need any assistance to get your unit functioning properly, please have your  
product information ready and contact Addonics Technical Support at:  
Hours: 8:30 am - 6:00 pm PST  
Phone: 408-453-6212  
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Activity LED  
The Activity LED glows to indicate the unit has power and blinks to indicate  
activity. It does not show RAID status.  
Mode Switch  
The Mode switch has four settings, described in detail below:  
Jbod  
This setting creates a non-RAID array called LARGE.  
Number of drives: 2  
Unit capacity: 100% of all drives together regardless of differences in size  
Fault tolerance: cannot withstand the loss of any drives without losing data.  
However, some data may be recovered as long as the top drive carrying the  
file system data (boot record, directory, etc.) remain online. LARGE mode is  
neither a RAID nor is it a JBOD. It works by declaring the sum of all available  
space of the member drives as a single unit, without striping the data. After  
the first member is filled, new data is stored on the second.  
RAID 1  
This setting creates a Mirror Set.  
Number of drives: 2  
Unit capacity: size of the smallest member.  
Fault tolerance: RAID 1 can withstand the loss of one drive without losing  
data.  
RAID 1 works by duplicating the exact same data on both drives.  
RAID 0  
This setting creates a Stripe Set.  
Number of drives: 2  
Unit capacity: size of the smallest member times two.  
Fault tolerance: none - if either member is lost all data is lost.  
RAID 0 “stripes” the file system across the array by placing “chunks” of data  
sequentially between drives in a specific order.  
Nor  
This setting allows the drives to act independently of each other (“JBOD  
mode”).  
Number of drives: 1 or 2.  
Unit capacity: N/A (100% of each individual drive)  
Fault tolerance: none  
JBOD mode offers both connected units to the host adapter, no RAID is  
defined at all.  
NOTE: JBOD mode with two drives requires a SATA controller featuring Port  
Multiplier support.  
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Technical Support (M-F 8:30am - 6:00pm PST)  
Phone: 408-453-6212  
Using the Mode Switch  
The unit will only set up a RAID or LARGE array if it is currently set for  
independent drives (Mode Switch set to “Nor”). If an array is defined and a  
different array setting is desired, the unit must be powered up one time with  
the Mode Switch set to “Nor” before a new array will be created. Otherwise,  
simply set the switch to the desired setting and power up the unit. Leave the  
Mode Switch set to the desired array type.  
NOTE: Setting or modifying the mode destroys all data.  
Using the JMicron RAID Manager  
Windows users may install the JMicron HW RAID Manager application  
located on the SATA Controller CD, or download it from  
tion Utilities → JMB393.  
Mac and Linux users may download those versions of the same utility from  
The JMicron RAID Manager can be used to monitor the health status of the  
RAID drives, and provide status alerts with dialog boxes and even email.  
Using the JMicron RAID Manager to create or modify an array is NOT  
recommended. The Mode Switch should be set to the desired type of array at  
all times to prevent data loss.  
CONTACT US  
Phone:  
Fax:  
408-573-8580  
408-573-8588  
Email:  
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