LS441D Create RAID5 Fails

[ab1000000]

I have an LS441D, and quantity 4 Western Digital 6TB red drives.  I've been trying to create a RAID5 array using all 4 disks.

When I do so, I consistently get a dialog message box that array creation failed.  Yet all of the disks seem "busy", as it all of the green lights are being accessed rapidly, and the the status light flashes one long, followed by 4 short.

What I've done so far:

After messing with it, I've concluded that the disk system might be still trying to make the array.  Yet, after leaving it sitting for 2 days straight, the green lights finally stop flashing - and then I check the status in the UI, to find that all of the disks are "failed", and that there is no recognized RAID array.

Rebooting the disk system doesn't help - it then reports that all drives are "unformatted", still no RAID5 array.  Attempts to format them fail, and there is no way to re-create the RAID5 array.

Reading some other posts, I learned that I can wipe out the partition info on the disks by using the Windows diskpart utility, attaching the drives one by one to another machine.  I've done this, and and pretty sure that the partition data is gone.  Then I've repeated the boot-up sequence and attempt to create RAID5, failure, and waiting 2 days - only to get to the SAME situation again.  At least it's repeatable.

Any ideas about why I can't make a RAID 5 array?  I'm on firmware 1.74, and the drives individually format OK before I attempt to make the array.  Not sure what else to try...

[ab1000000]

Yet another data point:  It appears that the maximum XFS file system size for 32-bit RedHat Linux is 16TB.  It's much bigger for 64-bit.

http://xfs.org/docs/xfsdocs-xml-dev/XFS_User_Guide/tmp/en-US/html/ch02s04.html

Can anyone confirm if the LS441D is using a 32-bit OS?  Does that affect the maximum file system size if I am trying to span RAID5 across 4 x 6TB drives?  Is that somehow over the limit??

[Texturtle]

Per the supported hard drives list here: http://www.buffalotech.com/content/files/products/Supported_HDD_List_LS441.pdf

no drives over 4TB are officially supported in that unit.

[ab1000000]

Yup.  And that's why I'm going to write a review on Amazon about it.