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About a year ago I installed ubuntu on my notebook and made it encrypt my hard drive. Problem is, I don't know what password I used back then, 'cause I haven't touched the notebook in a while.
Now I need a clean Windows OS on it. [How] can I install Windows 10 on this hard drive?
I did encrypt it via ubuntu not bios
1So the real question is "how do I unlock a locked drive when I've forgotten the password?" I suggest your [edit] your question to say this. – DavidPostill – 2016-03-23T16:18:47.290
Boot into gparted, delete all existing partitions on the HDD, then boot to the Windows 10 installation media and proceed as normal. – Ramhound – 2016-03-23T16:20:54.747
Did you encrypt it via BIOS or via linux? – Romeo Ninov – 2016-03-23T16:21:07.463
1If you did this from the bios configuration of your laptop then it depends on laptop model/brand and also disk model/brand, most of them can be unlocked with entering the bios as an administrator, if you did it with linux or some other software then simply delete the partitions. – arana – 2016-03-23T16:23:28.387
1Encrypting and locking a hard drive is 2 different things. Normally the hard drive is "locked" using the bios and a password. If it is only an encryption password, just format/wipe the drive using a boot disc, then install windows. – Moab – 2016-03-23T16:23:44.443