[SOLVED] Windows 7 Installed as UEFI on GPT formatted disk instead

mkaafy

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Jan 14, 2020
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Scenario:
  1. Windows 10 is installed on my main SSD -> UEFI, GPT
  2. Disabled Secure Boot, Enabled CSM
  3. Made a Windows 7 bootable USB flash disk with Rufus (BIOS, MBR)
  4. Formatted my secondary SSD as MBR
  5. Installed Windows 7 on it
Opened Disk Management and noticed the secondary SSD is formatted as GPT. That's not what I wanted.
How do I install a legacy Windows 7 on a MBR SSD, then?
 

onespeedbiker

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Apr 13, 2019
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First as I'm sure you know, GPT is a partitioning protocol, not a format. The only issue I can see is you probably tried installing Windows 7 on the secondary ssd while the Windows 10 primary ssd was still connected. Boot up Windows 10, go to the disk manager and delete the partitions on the secondary ssd. Then shutdown your computer, disconnect the primary ssd and boot to the secondary ssd with the Window 7 install USB. Direct the Windows 7 install to use MBR partitioning and then install Windows 7.
 
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onespeedbiker

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Apr 13, 2019
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First as I'm sure you know, GPT is a partitioning protocol, not a format. The only issue I can see is you probably tried installing Windows 7 on the secondary ssd while the Windows 10 primary ssd was still connected. Boot up Windows 10, go to the disk manager and delete the partitions on the secondary ssd. Then shutdown your computer, disconnect the primary ssd and boot to the secondary ssd with the Window 7 install USB. Direct the Windows 7 install to use MBR partitioning and then install Windows 7.
 
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onespeedbiker

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Than it's likely there is something wrong with your Windows 7 install media. a properly created Windows 7 install USB will do what you tell it to do. What install file (ISO?) are you using to create your USB installer? I would recreate the Windows 7 install USB and try again.
 
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mkaafy

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Jan 14, 2020
128
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First as I'm sure you know, GPT is a partitioning protocol, not a format. The only issue I can see is you probably tired installing Windows 7 on the secondary ssd while the Windows 10 primary ssd was still connected. Boot up Windows 10, go to the disk manager and delete the partitions on the secondary ssd. Then shutdown your computer, disconnect the primary ssd and boot to the secondary ssd with the Window 7 install USB. Direct the Windows 7 install to use MBR partitioning and then install Windows 7.
Oops, sorry.
It worked! You're the best!
 

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