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I have run DSM 5.2 for quite a while. Initially on HP microserver, then on ESXi. upgraded a couple of times(from dsm4). didn't have issue. This time, I upgraded from 5.2 to 6.1, also from ESXi to directly run on Lenovo ts440. It took me a while to make upgrade and migration work because I initially downloaded wrong loader image. When it finally worked, I noticed one of the 6 disks that make up my primary volume is missing. files are still fine though, but the volume was in 'degrade' state. Before I realized it was because DS3615 support upto 12 internal drives by default, and just by chance the missing drive was on the 13th slot, I did a couple of thing trying to identify which drive was missing and if it was damaged. - ... multiple try to pull out individual drive -- now two drives were missing. but I can get SHR back once I everything back - I narrow down to one of three drives, so instead of pulling them one by one, I rotate them in different slot. Let me call them A, B, C and this is in original slot order; after switch, the order became B, C, A. - now I can see that C was originally missing, but now A is missing and C appears but has error access system partition. and now the volume is "crashed". Now I think the fatal step was that I opt to "repair" the system partition on C at this point. I should have put everything back at this point. Of course I still don't have all the drives, but I finally remembered 12 disk limit by DS3615's default, and I change that to 24, expecting all would be good. However I was present with the degraded volume with 0 size and 0 available space, and the shared directories disappeared from both web interface and ls -l command (ssh remote in). the missing drive becomes available drive, so I can use it to 'repair' the volume. I started to really worry now, but still remain hopeful that after repair I will be able to recover some data. I was wrong. after repair I have a volume with full size (about 13T), but all used, and 0 byte free space, and all folders are still missing. I did back up my photo/home video folders, home folders, and shared document folders. I do wish to get my video library, music, and ebook libraries back, so that I don't need to go back the the original media (some might not here anymore). I am quite comfortable with linux command line, if someone can point out a way to recover the data it would be very much appreciated!!! Thank you in advance!