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OneDrive Files On-Demand & Windows 10 Storage Sense Settings  

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edp05373
(@edp05373)
New Member

Not sure if everyone knows this but in the Windows 10 Update v1709, there is a OneDrive setting that allows the user to only download files upon opening, but OneDrive will put a place holder for that file if it only synced but hasn’t been used.

https://support.office.com/en-us/article/save-disk-space-with-onedrive-files-on-demand-for-windows-10-0e6860d3-d9f3-4971-b321-7092438fb38e

Interestingly enough, if you are doing an analysis and notice that a file in the OneDrive folder is all zeros in hex view, this is likely the culprit. I initially noticed this when I used EnCase to hash all my files and then created a MD5 list of a OneDrive folder and noticed SEVERAL files with no MD5 values, which were also all zeros in hex view. So if you create a MD5 list and then review it in Excel, it appears that anything with a blank MD5 value will NOT be on disk and in the cloud only.

The setting for that flag is here

\Users\\AppData\Local\Microsoft\OneDrive\settings\Business1\global.ini

And look for SavedPlaceholdersEnabledState = true

If it is true, then Files On-Demand is turned on. If false, then all of the files should physically be on the disk.

There is also a Windows OneDrive setting (right-click) to “Always keep on this device” which should physical place the file on disk, but I do not know where that setting flag is. I assume it is in a .dat file of some sort. The user can also manually select a OneDrive file that is physically on-disk and make in online-only again by using the right-click option on a file to “Free up space”. This leads to the file placeholder being all zero again in hex.

HOWEVER, there is also a Windows 10 setting called “Storage sense” that if it is turned on, it COULD make the file back to “Online only” after 30 days on non-use. However this time period can be changed by the user

https://support.office.com/en-us/article/use-onedrive-and-storage-sense-in-windows-10-to-manage-disk-space-de5faa9a-6108-4be1-87a6-d90688d08a48

Storage sense registry settings at the end of this article

https://answers.microsoft.com/en-us/windows/forum/all/windows-10-storage-sense-registry-key/cee4f682-2472-4425-8656-72c00bb15ce4

NOTE This Storage sense setting can also auto-delete files from the Downloads folder and Recycle Bin WITHOUT user interaction. HOWEVER, the user can also trigger a cleanup at any time.

So the old days of “if it is in the cloud, it should be synced to disk” or “bulk deletion is suspicious” require a deeper look at settings.

Does anyone know if the other cloud storage services allow for this?

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Posted : 10/04/2020 4:24 am
randomaccess
(@randomaccess)
Active Member

We added a whole new cloud section into the FOR500 class to cover exactly this

You can check out Chad's webcast on some of the stuff that's covered and some of the cool stuff he found.

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Posted : 12/04/2020 1:20 am
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