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Formatting partition problem

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Jun 26, 2017
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Hello,

I hope this is the right place to post this. I've been looking on the webs like a mad man to find an answer to my problem but couldn't find a single answer that would fix it, so I came here to share it with you all.

I have problems whit installing Sierra on my PC (which is compatible), I can't "erase (Disk Utility)" my partition on which I would like to install my Sierro on. (I have Windows 10 installed on it before and made a partition, the SSD has GPT scheme).

The error I get is the following:
mUgSV4r.jpg


The partition is 70GB.

What I have tried:
- Tried multiple formats to start with (exFat and NTFS which was a desperate attempt)
- Created a new EFI partition of 300MB (read somewhere the standard 200MB wouldn't be enough)

BTW: I'm using UEFI Boot Mode

If anyone could help me, that would be great! (I'm pretty new to multibooting)

Specs
MB: MSI B150M PRO-VH B150
CPU: Intel Core i5-6600K
RAM: 2x DDR4 8GB 2400-16 Ballistix Sport LT CRU
SSD: Crucial BX200 240GB
GPU: ASUS 4GB DDR5 X STRIX-GTX970-DC2OC R
 
Not a Desktop Guide - Moved to Multi Booting.
The 'sticky' guides in this forum may help with your problem.
 
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