Solved Convert 7 install From UEFI To legacy

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Yippee38

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My system has several drives, two of which are 4TB drives. The two 4Gb drives are using GPT partition schemes. However, I'm booting off of a 240GB SSD which is using a MBR scheme.

When I installed my current motherboard, I did a fresh install of Windows 7. I didn't know much about UEFI, except that I hate it. Now I discover that there is an option to boot in legacy mode. I know in linux I can convert an existing system from UEFI to legacy mode by changing the EFI partition.

My question is, can I convert an existing Windows 7 install FROM UEFI TO legacy mode? If so, how?
 
Last edited:

My Computer My Computer

At a glance

Windows 7 Home Premium 64-bitIntel i7-4790KKingston 8Gb + G.Skil 8GbEVGA GeForce GTX 980Ti (x2)
Computer type
PC/Desktop
OS
Windows 7 Home Premium 64-bit
CPU
Intel i7-4790K
Motherboard
GA-Z97X-Gaming 7
Memory
Kingston 8Gb + G.Skil 8Gb
Graphics Card(s)
EVGA GeForce GTX 980Ti (x2)
Sound Card
Asus Xonar DX
Monitor(s) Displays
Acer Predator XB271HU (x3)
Screen Resolution
7680x1440
PSU
EVGA SuperNOVA 1300 G2
Keyboard
Ducky Shine 3
Mouse
Corsair M45
Antivirus
ESET NOD32 Anitvirus
Not without reinstalling windows, as far as I know.

Why do you want to convert it ? You`ll gain nothing.

UEFI or Legacy is just an option in the bios, easily changeable, you choose that before you install windows.
 

My Computer My Computer

At a glance

Windows 10 Pro x64Intel Core i7 6700KGSkill TridentZ RGB 16GB 3600 16-16-16-36EVGA GTX 980 Ti SC x2
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Skylake Special #666
OS
Windows 10 Pro x64
CPU
Intel Core i7 6700K
Motherboard
Asus Sabertooth Z170 Mark 1
Memory
GSkill TridentZ RGB 16GB 3600 16-16-16-36
Graphics Card(s)
EVGA GTX 980 Ti SC x2
Sound Card
Realtek High Definition
Monitor(s) Displays
AOC G2460PG
Screen Resolution
1920 x 1080 144Hz
Hard Drives
Samsung 860 Pro 256GB, Seagate Barracuda 4TB x2
PSU
EVGA 1000 P2, EVGA White Custom Braided Cables
Case
Corsair Vengeance C70 Gunmetal Black
Cooling
Corsair H100i v2, Corsair ML120 x2, Thermal Grizzly Kryonaut
Keyboard
Logitech G910 Orion Spectrum
Mouse
Logitech G700s
Internet Speed
Verizon Fios Quantum Gateway 75/75
Antivirus
Windows Defender, Malwarebytes Free 3.8.3
Browser
Chrome
Other Info
Corsair SP120 x4, LG Blu-ray Drive, Durabrand HT-395 100 Watt Dolby Digital Amp, Corsair H2100 Wireless 7.1 Headset
AddRAM said:
Not without reinstalling windows, as far as I know.

Why do you want to convert it ? You`ll gain nothing.

UEFI or Legacy is just an option in the bios, easily changeable, you choose that before you install windows.
Click to expand...

Because UEFI is a PITA and it's annoying me.

Unfortunately, that's about what I though, otherwise I think there'd be more about it online.
 

My Computer My Computer

At a glance

Windows 7 Home Premium 64-bitIntel i7-4790KKingston 8Gb + G.Skil 8GbEVGA GeForce GTX 980Ti (x2)
Computer type
PC/Desktop
OS
Windows 7 Home Premium 64-bit
CPU
Intel i7-4790K
Motherboard
GA-Z97X-Gaming 7
Memory
Kingston 8Gb + G.Skil 8Gb
Graphics Card(s)
EVGA GeForce GTX 980Ti (x2)
Sound Card
Asus Xonar DX
Monitor(s) Displays
Acer Predator XB271HU (x3)
Screen Resolution
7680x1440
PSU
EVGA SuperNOVA 1300 G2
Keyboard
Ducky Shine 3
Mouse
Corsair M45
Antivirus
ESET NOD32 Anitvirus

My Computer My Computer

At a glance

Win-7-Pro64bit 7-H-Prem-64biti7-5930K 2nd i9-9940x both water blocked VRM'...Trident-z 3200C14 2nd Trident-z 3600C16EVGA 1080ti ftw3 2nd Titan Xp both water blocked
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom assembled by me :}
OS
Win-7-Pro64bit 7-H-Prem-64bit
CPU
i7-5930K 2nd i9-9940x both water blocked VRM's too
Motherboard
ASUS SABERTOOTH X99 2nd ASUS x299 Apex
Memory
Trident-z 3200C14 2nd Trident-z 3600C16
Graphics Card(s)
EVGA 1080ti ftw3 2nd Titan Xp both water blocked
Sound Card
Built-in Realtek
Monitor(s) Displays
1-AOC G2460PG 24"G-Sync 144Hz/ 2nd 1-ASUS VG248QE 24" 144Hz
Screen Resolution
1920 x 1080 144Hz
Hard Drives
2-Samsung M.2 Evo & Evo Plus
2-Samsung 850 EVO 500GB SSD's/ 3-2.5 W.D. Black 1tb-&3-1tb/3-3.5 WD Black 1tb hdd's
PSU
EVGA SuperNOVA 1000-P2 2nd 1200-P2
Case
2-Corsair Obsidian Series 450D Black ATX Mid Tower
Cooling
Custom water loops
Keyboard
Logitech G710+/ 2nd Logitech G910
Mouse
2-RedDragon M901 Perdition 16400 dpi Gaming mouse = wired
Internet Speed
Comcast Ping 19ms 89.31mbps download speed 6.12mbps upload
Antivirus
Malwarebytes Pro/ Superantispyware Pro
Browser
FireFox & Pale moon
Other Info
2nd ASUS X299 Apex/Intel i9-9940x with Custom water loop/7H-Prem-x64/Corsair 450D case/Ram Trident-z 3600C16 4x8gb / Samsung970Evo plus 500gb SSD/Dual ssd EZ swap evo/PSU EVGA SuperNova 1200w-P2 80+Platinum/GPU Titan Xp /8-ML-140 on push-pull on 2-280GTX rads
It`s just a BIOS and has nothing to do with windows. How often does one go into the bios, rarely.

If you want to use Legacy mode and a MBR partition style you`d have to reinstall windows. ( The only way I ever install windows )
 

My Computer My Computer

At a glance

Windows 10 Pro x64Intel Core i7 6700KGSkill TridentZ RGB 16GB 3600 16-16-16-36EVGA GTX 980 Ti SC x2
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Skylake Special #666
OS
Windows 10 Pro x64
CPU
Intel Core i7 6700K
Motherboard
Asus Sabertooth Z170 Mark 1
Memory
GSkill TridentZ RGB 16GB 3600 16-16-16-36
Graphics Card(s)
EVGA GTX 980 Ti SC x2
Sound Card
Realtek High Definition
Monitor(s) Displays
AOC G2460PG
Screen Resolution
1920 x 1080 144Hz
Hard Drives
Samsung 860 Pro 256GB, Seagate Barracuda 4TB x2
PSU
EVGA 1000 P2, EVGA White Custom Braided Cables
Case
Corsair Vengeance C70 Gunmetal Black
Cooling
Corsair H100i v2, Corsair ML120 x2, Thermal Grizzly Kryonaut
Keyboard
Logitech G910 Orion Spectrum
Mouse
Logitech G700s
Internet Speed
Verizon Fios Quantum Gateway 75/75
Antivirus
Windows Defender, Malwarebytes Free 3.8.3
Browser
Chrome
Other Info
Corsair SP120 x4, LG Blu-ray Drive, Durabrand HT-395 100 Watt Dolby Digital Amp, Corsair H2100 Wireless 7.1 Headset
On my new rig in 2 months more than in 7 years on my old rig :)
 

My Computer My Computer

At a glance

Win-7-Pro64bit 7-H-Prem-64biti7-5930K 2nd i9-9940x both water blocked VRM'...Trident-z 3200C14 2nd Trident-z 3600C16EVGA 1080ti ftw3 2nd Titan Xp both water blocked
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom assembled by me :}
OS
Win-7-Pro64bit 7-H-Prem-64bit
CPU
i7-5930K 2nd i9-9940x both water blocked VRM's too
Motherboard
ASUS SABERTOOTH X99 2nd ASUS x299 Apex
Memory
Trident-z 3200C14 2nd Trident-z 3600C16
Graphics Card(s)
EVGA 1080ti ftw3 2nd Titan Xp both water blocked
Sound Card
Built-in Realtek
Monitor(s) Displays
1-AOC G2460PG 24"G-Sync 144Hz/ 2nd 1-ASUS VG248QE 24" 144Hz
Screen Resolution
1920 x 1080 144Hz
Hard Drives
2-Samsung M.2 Evo & Evo Plus
2-Samsung 850 EVO 500GB SSD's/ 3-2.5 W.D. Black 1tb-&3-1tb/3-3.5 WD Black 1tb hdd's
PSU
EVGA SuperNOVA 1000-P2 2nd 1200-P2
Case
2-Corsair Obsidian Series 450D Black ATX Mid Tower
Cooling
Custom water loops
Keyboard
Logitech G710+/ 2nd Logitech G910
Mouse
2-RedDragon M901 Perdition 16400 dpi Gaming mouse = wired
Internet Speed
Comcast Ping 19ms 89.31mbps download speed 6.12mbps upload
Antivirus
Malwarebytes Pro/ Superantispyware Pro
Browser
FireFox & Pale moon
Other Info
2nd ASUS X299 Apex/Intel i9-9940x with Custom water loop/7H-Prem-x64/Corsair 450D case/Ram Trident-z 3600C16 4x8gb / Samsung970Evo plus 500gb SSD/Dual ssd EZ swap evo/PSU EVGA SuperNova 1200w-P2 80+Platinum/GPU Titan Xp /8-ML-140 on push-pull on 2-280GTX rads
Ya when we get new boards we could be in there 100 times trying to figure it out, but after it`s setup, rarely :)
 

My Computer My Computer

At a glance

Windows 10 Pro x64Intel Core i7 6700KGSkill TridentZ RGB 16GB 3600 16-16-16-36EVGA GTX 980 Ti SC x2
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Skylake Special #666
OS
Windows 10 Pro x64
CPU
Intel Core i7 6700K
Motherboard
Asus Sabertooth Z170 Mark 1
Memory
GSkill TridentZ RGB 16GB 3600 16-16-16-36
Graphics Card(s)
EVGA GTX 980 Ti SC x2
Sound Card
Realtek High Definition
Monitor(s) Displays
AOC G2460PG
Screen Resolution
1920 x 1080 144Hz
Hard Drives
Samsung 860 Pro 256GB, Seagate Barracuda 4TB x2
PSU
EVGA 1000 P2, EVGA White Custom Braided Cables
Case
Corsair Vengeance C70 Gunmetal Black
Cooling
Corsair H100i v2, Corsair ML120 x2, Thermal Grizzly Kryonaut
Keyboard
Logitech G910 Orion Spectrum
Mouse
Logitech G700s
Internet Speed
Verizon Fios Quantum Gateway 75/75
Antivirus
Windows Defender, Malwarebytes Free 3.8.3
Browser
Chrome
Other Info
Corsair SP120 x4, LG Blu-ray Drive, Durabrand HT-395 100 Watt Dolby Digital Amp, Corsair H2100 Wireless 7.1 Headset
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