Unexplained data

I reformatted the drive on my My Cloud ex4100 and now notice that it shows 319.64 mb worth of data. I have not saved any thing to the NAS and when I open it in windows file explorer there are no files. I did this reformat because there was over 6 tb listed under Other and I could not find the data in windows file explorer.

Any idea what how I can find out what this data consists of?

See the dedicated subforum for the EX Series where people more familiar with that device may be able to assist. And where there may be past discussion similar to your question.

https://community.wd.com/c/network-attached-storage/my-cloud-expert-series

This subforum (My Cloud) is generally for the single bay/single drive My Cloud which is a different device than the EX Series.

@ordnance1 What about the eight apps you have on it?