BE CAREFUL!!!!!!!!!!!!!!!!!!!!!!!!
I have a DNS-323 with FW 1.05. I recently added a second WD 750GB HD to the unit to do Raid 1. I had the original drive in the correct bay, and added the second drive in per the website's instructions.
When I logged back into the GUI, it immediately recognized the second drive and asked if I wanted to make it a Raid1 or Raid0 config.
Like an idiot, I was anxious to get this going, so I didn't back up my drive info. Well, as I followed the steps to configure Raid1, and even though the GUI said it wouldn't loose or format any of my data on the original drive, it completely formatted my original drive's data.
Since then, I was able to abstract 80% of the lost data, but it didn't use my naming convention or sub folders. It just numbered the files and I now have to go through 45K files to determine what they are.
The good news is the the Raid configuration now works great. I am a little concerned about a crash and having to bring up a second drive again, but I will get to that stage when I need to. I now back up my PICs and some word docs to another drive. I do this just in case a fail over doesn't work as it is supposed to.
I would love to hear from others who have experienced a successful rebuild, without any data loss, and then I will have more confidence with the unit.