Why is there a 3.68 gb CDFS storage being created when I transferred data from my flashdrive?

[Sabrina S22]

I transferred around 13 GB of data from a flashdrive to the D drive. When I inserted the flashdrive, two volumes appeared, one being a CDFS containing 3.68 GB of data. I didn't think of it as anything so I continued to transfer data(which included an application) When it was done, I safely removed the flashdrive, and the CDFS was still there.I didn't know where the 3.68 GB is allocated in my PC, so I deleted it after 2 days, and now the application isn't running. It was running just fine before I deleted the CDFS.Note: I'm an amateur, I am not that knowledgeable in windows stuff.

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