keinreis

Done.  Seems to have worked.  After installing that version of Scanner, I am no longer getting File System Damage warnings on all the drives in my pool.  
Though I'm not certain these were all "false positives".  Throughout my many rounds of testing the drives, CHKDSK /F  had reported what appeared to be legitimate MFT Mirror Corruption and/or Bitmap Errors.  But those have likely been resolved/repaired, and no new warnings have been triggered.  So I think (hope) I'm good.  
I am now in possession of 5 new Seagate 8TB External USB 3 drives.  My plan was to shuck those, and install the drives in some sort of external enclosure.  I prefer to avoid USB 3, and I've had plenty of issues with eSATA in the past.  My server mobo has USB 3.1 Gen 2 ports (10Gbps) on it (1 Type A and 1 Type C).  I see that there are a few enclosures with USB 3.1 Gen 2 connections.  The speed of USB 3.1 Gen 2 is appealing, but would it also be prone to the same kinds of disconnection issues as USB 3.0/3.1 Gen 1?
Next month, I will get two more 8TB internal (NAS) HDD's, which will finally allow me to turn on duplication on my entire pool.  This has been a process, but progress is being made.
Thanks for all the help!
 

2.2.1.922_x64_RC has been installed.  But I have not been noticing any file access issues lately.  My main issue now is the multitude of File System Damage warnings I am getting on every drive in my pool, even after repeated repairs via CHKDSK /F.  
I also took Jaga's advice and tested every one of these drives in another PC.  I ran CHKDSK /F on each drive.  No file system issues were found on any drive.  But just to be sure, I also used the drive manufacturer's diagnostic software to test each drive.  No SMART warnings, no file system errors, no bad sectors.
 I then reinstalled these drives back in my server, and reset the "File System Health" status to "unchecked".  The status changed Immediately to "File System Damaged" on each drive as soon as I did that.  I ran CHKDSK /S on each drive again, and it found MFT Mirror and bitmap errors on every drive in my pool.  They had been installed for less than 5 minutes.  Not enough time (even for me) to cause an unexpected shutdown or BSOD. 
Any additional suggestions would be appreciated.  
   

I recently had to migrate data from 5 X 4TB HDD's that were in an old WHS 2011 setup when my eSATA enclosure's power supply died.  I was basically just using WHS 2011 as a file server, so I decided just to move on from WHS 2011 and build a Win10-based PC in a case with a lot of 3.5" drive bays instead.  Before I built the new PC, I backed up all the data on the 5 X 4TB HDD's to external USB drives.  I wasn't using DrivePool on WHS 2011.
 
Upon completing the build of the new PC, I decided to give DrivePool a try.  I purchased the 2.0 version, and installed it.  I then installed three brand-new 4TB drives, and created a new pool - adding those three drives to the pool.  I copied over as much data to those three drives from the external USB drives to the three HDD in the pool as would fit.  I still had two drives from the old WHS setup, which were less than a year old, and checked out healthy  -so I decided to re-use them at least temporarily.  Having read that drives with existing data could be added to a pool, I just installed those old 4TB drives and added them to the pool.  I moved the data out of the old WHS 2011 ServerFolders into new folders, and added those folders to the pool.  I ended up with exactly what I set out to have - five 4TB drives, and their data, in a pool.
 
I know DrivePool offers file duplication, but I just don't have enough free space on my drives to duplicate everything that I would need to.  I also prefer to have an offline backup, so I set up Allway Sync to sync all the data in my pool back to the same external USB drives that I had previously used to back up that data in the first place. I have added no new data to the drives in the pool yet.  Even the folder structure is identical between what's in the pool, and what's on the external USB drives.  
 
I am now attempting to set up a one-way sync from the pooled drives back to the external USB drives in Allway Sync.  When Allway Sync "analyzes" the data between the pooled drives and the external USB drives, it doesn't recognize that any of the existing files are already on the USB drives.  It wants to copy everything over again - which shouldn't be necessary.
 
I'm new to the pooled drive thing, so maybe I'm missing some elementary understanding of how it works.  Any idea what I need to do to set up the sync properly so I don't have to copy all the files over again?
 
Thanks!