It's quite uncommon to have Windows on d: and data on c:. But it's not forbidden.
I have sold my Asus laptop after having done a recovery of windows but I scream about my ancient windows datas. In fact, windows was installed on D:// (with program files etc...) and my datas on C://. I have selected the first option of the recovery system "recover windows to first partition only". So is it possible that my ancient windows is still on D:// with all the files related to (App data, program files...) ?
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