Help me assembly JBOD/spanned in DMDE with missing drive

[Avenge7058]

Hi all!
I have a Windows spanned volume on my 3 WD 4 TB hard drives. Unfortunately, when I connected them to make a backup of recent content, the last one (which should be empty/nearly empty) failed.

Now I'm trying to assemble this volume in DMDE to copy my data to a backup drive, but after trying to construct RAID > JBOD and adding my 2 drives, I have this result. I can open this volume ("Archiwum") and it shows the whole FS but only files from the first drive are visible. (adding a NULL disk as the 3rd disk make the same result)
Thank you for help!

[Arch Stanton]

If you used Windows to create the span I suppose you spanned partitions and so for example offset will not be zero.
Add partition TAB screenshots for both individual drives.

I can open this volume ("Archiwum") and it shows the whole FS but only

Yeah, it would even with only first drive attached.

[Avenge7058]

I don't exactly know what you mean by partition TAB?

But I assume that maybe it will be this:

First drive

Second one

Thank you for your help!

[Arch Stanton]

Try adding those two 4 TB LDM data partitions to a JBOD in DMDE instead (so offset 32768, size 7814037134). Adding null disk you could even not bother with, if DMDE complains about volume size just ignore that.

[Avenge7058]

Okay so this (if I did it correctly) didn't seem to help

[Arch Stanton]

Pick archive NTFS > Open volume

[Avenge7058]

I did it, and it still shows all of the folders but only files from the 1st drive are visible

[Arch Stanton]

How would you know that? I mean I have 1 TB SSD, 70% used, but how would I know 'physical' location of the files unless I specifically look in MFT where a file is located?

[Arch Stanton]

Also 7814037134 is NOT end location, it's number of sectors.

[Avenge7058]

I know that because I have sorted everything by years.
Since it is a spanned volume, the 1st drive is being written 1st,
so I can see that I have all the files in 2018, and newer files are missing from the folders.

[Avenge7058]

I can't paste a 7814037134 into the "number of sectors" because it says that selected range extends beyond the device bounds

[Arch Stanton]

My bad, 7814037134 is last sector. So should be, so offset: 32768, end: 7814037134, number sectors: (7814037134 - 32768), you can also simply click 'partition' and select the partition.

I know that because I have sorted everything by years.
Since it is a spanned volume, the 1st drive is being written 1st,

While in general this is true, data is written towards start of volume as rule of thumb, it's not something you can take for granted. This volume has about 35% free space, see how data is actually spread out:

bitmap.jpg (24.57 KiB) Viewed 6048 times

Last edited by Arch Stanton on October 29th, 2023, 7:56, edited 1 time in total.

[Avenge7058]

Yes, but it was a 12TB volume and filled with around 7,5tb of data
so if I do not see the files from the last couple of years it is logical that they are in the second drive

Also, if I attach only 1st drive I have the same result as when I attach both so the files from this 2nd drive are missing

[Avenge7058]

My bad, 7814037134 is last sector. So should be, so offset: 32768, end: 7814037134, number sectors: (7814037134 - 32768)

I did that few posts before with the same efect.

[Arch Stanton]

Okay, select the 2nd drive you're adding to the JBOD, so just that one disk, click advanced, it opens hex view. Scroll through it, does it show data? Enough to add up to 3.5 TB? Estimate it, 3 out of every 4 sectors should contain data in that case.

[Avenge7058]

Yes, it is nearly full of data

[Arch Stanton]

Okay, then try .. Make the JBOD like before (offset: 32768, end: 7814037134, number sectors: (7814037134 - 32768), you can also simply click 'partition' and select the 4 TB partition). Select the Archive partition like before. Click 'all found / virtual file system' > pure FS.

If you still don't see files then ..

Click meta data folder and select MFT > right click it > Open entry > expand Data attribute (see pic) and post screenshot please.

[Avenge7058]

When it was doing it, it said multiple times "Error reading MFT # "
Files are still non-visible
I'm including this MFT entry

[Avenge7058]

Also, when I look at MFT between LUN#0 and #1, on LUN#0 it shows file names etc.
However, on the LUN#1, it's not

[Arch Stanton]

When it was doing it

Doing what exactly?

Oh and, what happend to 3rd disk anyway? It failed you said, but how exactly, is it dead?