I have dual OS (Ubuntu and Windows 10) on SSD and have one additional HDD.
If I boot first with Ubuntu, the HDD is read only.
If I boot with Windows first, then reboot with Ubuntu, Ubuntu can write to the HDD.
How can I make the HDD writable, when I first boot with Ubuntu ?


Is it possible that you have fast boot turned on in windows 10? That used to make my HDD's unreadable as well as unwriteable. Please check try this and check again : https://in.answers.acer.com/app/answers/detail/a_id/37059/~/windows-10%3A-enable-or-disable-fast-startup

I turned of fast boot, while it does load my windows 10 a bit slower, I don't have to boot to windows then reboot to ubuntu to make it work.

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