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[cable2]

Hi again,
I don't know if you are a linux guy but if you are, I would try pulling a drive and looking at it on your linux machine to see if you can find any "hidden" files / folders.  It might be possible to do something similar with one of the windows apps to do this but I am sure of neither option.  Just a thought. Good luck.
Update for windows only users.
http://forums.dlink.com/index.php?topic=41734.0
Courtesy of JavaLawyer (Sticky)

[JavaLawyer]

Any update on this issue?   

[maki]

I pulled out one HD to see what is on it. Windows could not read what was on the disk but it detected 2 partitions! Unfortunately i couldn't start linux on my machine from boot disk. The friend who was helping me will bring at some point in the future his laptop with linux and we will plug my HD into it to see if there is anything of importance. I will post here result. 
By the way when i turned on NAS with one HD everything was on it and accessible, so it was successful simulation of one HD failure in RAID1 on DNS 320
Unfortunately it will take between 6 and 7 hours to rebuild RAID (if speed doesn't change)

[ivan]

Maki, if you are using a windows computer and you want to read a linux formatted disk check out the sickies at the beginning of this forum, JavaLawyer has done a good job of distilling the ways to do that that have been posted here including what software is needed if you can't boot using a live linux CD/DVD.

[maki]

I have just plugged each of my HDs into laptop with linux and it shows one HD with 1.1 TB, and other with 802 GB of space. No files in either of them. And much of properties are unknown! Any advice?

[maki]

A little more detail:
HDDs are connected through USB dock.

listed devices.

vlada-AMILO-Pi-3525 ~ # ls /dev/sd*
/dev/sda   /dev/sda10  /dev/sda3  /dev/sda6  /dev/sda8  /dev/sdb
/dev/sda1  /dev/sda2   /dev/sda5  /dev/sda7  /dev/sda9  /dev/sdc


/dev/sdb  i  /dev/sdc  appear after HDDs are turned on.



Attempted mounting:


vlada-AMILO-Pi-3525 ~ # mount /dev/sdb /mnt
mount: you must specify the filesystem type
vlada-AMILO-Pi-3525 ~ # mount -t ext2 /dev/sdb /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

vlada-AMILO-Pi-3525 ~ # mount -t ext3 /dev/sdb /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

vlada-AMILO-Pi-3525 ~ # mount -t ext4 /dev/sdb /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

[ivan]

I hope you made a backup of your data while you could read one disk.

I have just plugged each of my HDs into laptop with linux and it shows one HD with 1.1 TB, and other with 802 GB of space. No files in either of them. And much of properties are unknown!

For a start if this is a RAID 1 array both disks should be the same but this is not what you show here.  It looks as if the disk with the largest amount of space has had a failure of some sort at some stage and the difference between the two disks is causing problems with the software trying to calculate the amount of free space in the RAID array.

At this point it would be better for you to reformat the RAID 1 array and restore your files from backup.

[maki]

When i returned HDDs in NAS everyting was like before (all files are there), and NAS UI reports that RAID 1 i OK. But, i will find another 3TB HD and make bcup and then reformat both HDDs in NTFS in some regular enclosure, and fill them completly to check HDDs, and then again put them in NAS and reformat in RAID1 and see if anything has changed. It will take some time to get large bcup HD but when i get one and try this i will post here the result.