Not Enough Space copying from Windows 10 - Maybe caused by Windows 11 Microsoft DLP service?

[jdolan01]

When copying to PR4100 from Windows 10 via either robocopy or Windows explorer, I now get error message “Not enough space on disk” even though I have 7.3 TB free and inodes are all 0% or 1% Use (except /usr/local/modules at 100%). I have been running backup for years without any problem.

It is only a problem with Microsoft Office files and pdf files. Other types of files copy OK.

It seemed to start when my company IT installed some new security software on my Windows 11 work laptop (listed below), maybe to prevent copying files to unsecure locations. However, I can copy files from the Windows 11 laptop to my Windows 10 personal computer over the network, but I get the error trying to then copy those files from my Windows 10 personal computer to PR4100 over the same network. However, if I first open and save the files using my older version of Microsoft Office 2007 under a new name on my Windows 10 personal computer, and rename back to original name, I can then copy no problem from Windows 10 personal computer to PR4100 without any problem.

My Windows 11 laptop is running CrowdStrike Falcon Sensor Service, Microsoft Purview Data Loss Prevention Service, and Microsoft Malware Protection DLP User Agent and I am using Office 365. I’m guessing it is something the Data Loss Prevent (DLP) service is doing to protect files, and the protection is removed when I save the file on my Windows 10 personal computer using an old 2007 version of Microsoft Office. Maybe Microsoft Purview or Office 365 is embedding sensitivity labels into the meta data of Office documents and PDFs that causes the error during copying. Very frustrating and strange issue. Any ideas how to handle this better when copying many files, instead of opening and saving them under new names.

[kencarter556]

The problem is caused by Office files and PDFs containing metadata or sensitivity labels added by Microsoft Purview DLP and Office 365, which the WD My Cloud PR4100 cannot handle over SMB, resulting in the “Not enough space on disk” error. Other file types copy without issue because they don’t have these attributes. Opening and saving the files in an older version of Office removes the metadata, allowing them to copy successfully. To handle large batches without opening each file manually, you can strip metadata in bulk using PowerShell or other tools, copy the files via FTP or SFTP, or compress them into ZIP archives before copying. This makes it possible to transfer Office and PDF files to the NAS without errors.

[jdolan01]

Thanks for good explanation of the cause. I want to continue to use robocopy, so ftp is out. For your other proposed solutions which sound good, how to remove in powershell or using what tools?