Re: Windows partitions lost after installing ubuntu??
The 1TB drive shows SFS -- which means any Basic Disks (MS's term for partitions) that were there before have been converted into Dynamic Disks. This is done automatically in MS Windows when you try to have more than 4 primary partitions on a single drive that is not GPT or UEFI.
Linux can't handle Dynamic Disks, so it can't accurately report what is there, and it can't install to them.
There are s couple of Windows products, which can be downloaded and burned to CD, that will convert Dynamic Disks back to basic -- but I think you have to purchase the PRO options of either: Partition Wizard or EASEUS Partition Master.
Ubuntu 20.04, Mint 19.10; MS Win10 Pro.
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