i was enjoying it thoroughly, until it said sorry you now have to pay.... at first i thought "well played microsoft" this is great as we have paid for every other one so why not a free one for good measure. then bam!! sysem became usless.. i guess they wanted to catch the pirated users to buy in. i got so used to it and enjoyed so i just bought it. i best thing since windows XP, simple and sturdy.... my windows now has disabled me from accessing my drives and i cannot even get into bios.. but i read a review that said spam the del button, or unplugg a hdd and force bios boot. before i post a new topic or blog so to speak. have a lekka day further.
I don't know what you installed, but an Unactivated Windows 10 does not "become useless", or disable access to any drives.
I have a long term Win 10 Pro, Unactivated, to test exactly this concept.
Installed Dec 8 2016, 584 days.
Running exactly as it did on Day 1.