Hi @Arnauld12 welcome to this free user-to-user Alienware laptop discussion forum. 

When in Windows 10 64-bit operating system, the 1TB drive's partition requires a drive letter. Please open Disk Management and share image in your next post. 

If the drive was installed under the Linux OS, the filesystem is probably ext4 or a variant of it, which Windows cannot natively read.

Under Linux, open a command prompt and type 

df -k

If it return an ext filesystem, that's why Windows cannot see it.

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@ejn63 wrote:

If the drive was installed under the Linux OS, the filesystem is probably ext4 or a variant of it, which Windows cannot natively read.

Under Linux, open a command prompt and type 

df -k

If it return an ext filesystem, that's why Windows cannot see it.

 

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Yes, my non recognized disk is ext4. Is there anyway to have it recognized by both Linux and Windows? As I don't have a lot of things on it I could easily backup and change ext4 for something else so it can be recognized by both Windows and Linux.

Here is a screenshot:

 The non recognized disk is disk 0.

Hi @Arnauld12 thank you for sharing Disk Management image. 

dual boot - Hard drive shared between Linux and Windows - Ask Ubuntu.  

Having opened the windows 10 operating system at dual boot, please right click on Disk 0 and assign a permanent letter to the 1TB Data drive. How to assign permanent letters to drives on Windows 10 | Windows Central. 

Hi,

I reformated the disc in exFAT.

Thank you all for your help.