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Hey TechInferno Community, I'm new to formatting a machine and it just so happens that the first machine that I really want to clean up my system is the Y580 with its 16GB mSata + 1 TB 5400 RPM combo. I'm not really well versed in learning how to install Windows at all but what I really want to do is simply reinstall Windows 10 back onto my computer with absolutely nothing on it besides the bare minimum. I bought this laptop when it came with Windows 8 and I have gone and made the upgrade to Windows 10 not through a clean installation. When I checked my partitions, I saw a lot more than I last remembered... I sifted through many articles and basically understand a bit when it came to reinstalling Windows in general but I'm not too sure with the Y580 setup. I hope someone out there can help fix this weird partitioning and giving steps on how to reformat! Thanks a lot http://i.imgur.com/bTiQB80.jpg

Step 1 If you have one partition (it's not the default) for windows like me (the other partitions that you see are form the external drive) click drive options (advanced) and delete the partition. If you have two (the default for windows installations), delete first the big partition and then the small 100MB System reserved one. Step 2 After delete the partitions you will have one big Unallocated Space on Disk 0 Click new and apply You will have something like this Step 3 Press Shift - F10 to open the console and type: diskpart 1) select disk 0 2) select partition 1 3) active 4) select partition 2 5) format fs=ntfs quick unit=64k 6) exit and again exit Now click Refresh and then click on the Disk 0 partition 2 and press next Step 4 After you finish with windows installation open a command promt as administrator and type: fsutil fsinfo ntfsinfo C: If it says Bytes per cluster: 65536 then your installation was successful and your cluster size (or else allocation unit size) is 64K instead of 4K.