■RAID 5 Function of the Extension Unit

Summary of the RAID 5 function (Redundant Arrays for Independent Disks, independent data disks with distributed parity blocks)

It is possible to use the RAID 5 function with an optional extension unit.

RAID level 5 regards 3 or more drives as one drive, and it is possible to read data by attaching error correction data even though one of the drives is broken automatically. (It is impossible to recover data if two drives are simultaneously damaged or the second drive fails during the data recovery process.)

RAID level 5 requires a minimum of 3 drives to implement. When using the RAID function, the logical disk size of the extension unit will be as below.

Logical disk size = Smallest size of the disk among the disks in the extension unit x (Number of the disks in the extension unit - 1)

Note: Depending on the model of a hard disk drive, the logical disk size may be a few percent smaller than the size resulting from the formula above.

Important:

•When connecting two extension units or more with this unit, it is impossible to connect the extension unit with the RAID 5 function and the one without the RAID 5 function at the same time.

•When the RAID 5 function is used, it is impossible to use two hard disks in this unit. The recorded pictures in those disks will not be deleted.

●Setup/cancel the RAID 5 function

Do the following to set or cancel the RAID 5 function with an optional extension unit.

Refer to the operating instructions of the extension unit for further information.

z Make sure that the power of this unit and all of the extension units to be connected is OFF.

xTo set the RAID 5 function, set the mode switch of the extension unit to "RAID 5".

To cancel the RAID 5 function, set the mode switch of the extension unit to "SINGLE".

cMake sure that the HDD POWER switch of the extension unit is "ON".

vTurn the power of the extension unit on.

bTurn the power of this unit on.

→The "HDD DISK MENU" will be displayed automati- cally after the system check when the hard disk configuration has been changed such as when an extension unit is newly connected.

Important:

•When the RAID 5 function is set or canceled, all data on each hard disk of the extension unit will be deleted.

•When turning the power on, turn on the power of the extension unit first, and then turn the power of this unit on. Otherwise, the extension unit may not work correct- ly.

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Panasonic WJ-HD309A, WJ-HD316A 144, RAID 5 Function of the Extension Unit, Setup/cancel the RAID 5 function
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