Windows 8.1 erasing and changing files with chkdsk on external drives. Unnaceptable.

I work for IT support for a small production studio.
They use Windows 7 and Windows 8.1 for they workstations and linux on the rendering farm.
There is an automated system with a nas to make backups of the production assets and renderings.
They have ESATA ports on all the wokstations and use external hard drives to make backups of users files, each user has the responsability of make his /her own backup of personal files (or files from his computer that belong to production like photoshop
patterns, brushes, licenses, rendering tests, plugins, etc).
A week ago the main hard drive of one of the workstations failed.
No problem. New, hard drive, fresh windows install, activation, production software, licenses from license server.
But at the time of restoring the files, the external hard drive of the user contained only old files, and some new but not all. At first time, the user was blamed, but hw swears that he backedup his files. Two days later another user complained that is disk
contained only the old files and his past backup was lost. I was called for help.
After several tests i was able to reproduce the problem:
Windows 8.1: Plug an external disk, make backups, copy new files erase old files, etc, eject the disk using safe removal.
Windows 7: Plug THAT DISK, erase files, copy new files, make backups etc.
Now here comes the problem: PLUG THAT DISK ON ANY COMPUTER WITH WINDOWS 8.1. A few seconds later windows reports that the disk had problems but some corrections were made and everything is ok. IT'S NOT. Any file copied from the prevous backup
is erased (or now it has zero size) and previously erased files are there again. Some of these files are corrupted now but windows says that the disk is OK.
-All the Workstations are up to date with a WSUS (as far as i know).
-The external hard disks are OK (even i used a new formated disk attached to an itnernal port to reproduce the problem.
Moving the backup disk between Windows 7 workstations is ok.
Moving the backup disk between Windows 8.1 workstations sometimes triggers the problem.
Moving the backup disk from a windows 7 workstation to a Windows 8.1 workstation ALWAYS triggers the problem.
Windows 8.1 automatically triggers chkdsk and autorepair the disk a few seconds after insertion unless the user has the disk busy, in that case pops an alert for resterting the computer, and again erases new files and undelete old ones.
First time in my life i see windows doing something like that to a healthy external hard drive.
The event viewer is filled with chkdsk errors like the 26226 and 26228.
We need a solution and i need an explanation of why this behaviour.
Thanks and sorry for my bad english.

Hi  Artag,
I want to know what kind of hard disk is that ? A GPT format or MBR format?
According to your description,  the GPT format hard disk might not be detected by a computer with a MBR format hard disk, vice versa, so, I suggest to check the disk format by plugining the hard disk to a bootable Windows 7 system, then:
In the Disk Management console, on the View menu, point to Top, and then click Disk List. The upper pane displays a list of disk drives that specifies the partition style in the last column.
The details about the get disk format steps and information about GPT format, you can find it below:
http://msdn.microsoft.com/en-us/library/windows/hardware/dn653580(v=vs.85).aspx  
Besides, a screenshot will be helpful for solving this.
Regards
Wade Liu
TechNet Community Support

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