Solved Reverse mbr2gpt on used SSD


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rzn6jw

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Win 11Pro v22H2 build 22621.2428
I had a 1Tb sata ssd that I was using to boot to my Windows 11 Pro. I had previously used it in Windows 10 and when I upgraded to Win 11 I used mbr2gpt. I have since upgraded to a 2Tb Samsung EVO Pro and now I want to use this old ssd as a boot disk for my wife's Win 10 Pro so I can upgrade her PC to Win 11.

Her current C: drive is mbr and I want to keep it as a backup if the move to Win 11 fails. However, the ssd from my system apparently has my system's gpt info on it as I can't Macrium her C: drive to the ssd and have the PC boot after changing her BIOS to UEFI.

Is there any way of formatting the ssd to remove the gpt info and make it mbr again? I checked the web and can't find anything about reversing the procedure.

Thanks
 
Windows Build/Version
v22H2 build 22621.1702

My Computer

System One

  • OS
    Win 11Pro v22H2 build 22621.2428
    Computer type
    PC/Desktop
    Manufacturer/Model
    DIY
    CPU
    AMD Ryzen 9 5950X
    Motherboard
    Gigabyte X570 Aorus Pro WIFI
    Memory
    64G DDR4 3200
    Graphics Card(s)
    ASUS RTX 4070 Super OC
    Sound Card
    Soundblaster
    Monitor(s) Displays
    LG 24"
    Screen Resolution
    3480 x 2160
    PSU
    Corsair 850W
    Case
    GameMax
    Cooling
    Deepcool LT720
    Keyboard
    Corsair
    Mouse
    Razor
    Internet Speed
    Gigabyte
    Browser
    Firefox
    Antivirus
    Norton 360
rzn6jw said:
I had a 1Tb sata ssd that I was using to boot to my Windows 11 Pro. I had previously used it in Windows 10 and when I upgraded to Win 11 I used mbr2gpt. I have since upgraded to a 2Tb Samsung EVO Pro and now I want to use this old ssd as a boot disk for my wife's Win 10 Pro so I can upgrade her PC to Win 11.

Her current C: drive is mbr and I want to keep it as a backup if the move to Win 11 fails. However, the ssd from my system apparently has my system's gpt info on it as I can't Macrium her C: drive to the ssd and have the PC boot after changing her BIOS to UEFI.

Is there any way of formatting the ssd to remove the gpt info and make it mbr again? I checked the web and can't find anything about reversing the procedure.

Thanks
Click to expand...

www.tenforums.com

Convert GPT Disk to MBR Disk in Windows 10

How to Convert GPT Disk to MBR Disk in Windows 10
www.tenforums.com www.tenforums.com



If you want to save the data on the SSD, use Option 1.
If you don't care about the data on the SSD, use Option 4.
 
Last edited:

My Computers

System One System Two

  • OS
    Win 11 Home ♦♦♦22631.3447 ♦♦♦♦♦♦♦23H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Built by Ghot® [May 2020]
    CPU
    AMD Ryzen 7 3700X
    Motherboard
    Asus Pro WS X570-ACE (BIOS 4702)
    Memory
    G.Skill (F4-3200C14D-16GTZKW)
    Graphics Card(s)
    EVGA RTX 2070 (08G-P4-2171-KR)
    Sound Card
    Realtek ALC1220P / ALC S1220A
    Monitor(s) Displays
    Dell U3011 30"
    Screen Resolution
    2560 x 1600
    Hard Drives
    2x Samsung 860 EVO 500GB,
    WD 4TB Black FZBX - SATA III,
    WD 8TB Black FZBX - SATA III,
    DRW-24B1ST CD/DVD Burner
    PSU
    PC Power & Cooling 750W Quad EPS12V
    Case
    Cooler Master ATCS 840 Tower
    Cooling
    CM Hyper 212 EVO (push/pull)
    Keyboard
    Ducky DK9008 Shine II Blue LED
    Mouse
    Logitech Optical M-100
    Internet Speed
    300/300
    Browser
    Firefox (latest)
    Antivirus
    Bitdefender Internet Security
    Other Info
    Speakers: Klipsch Pro Media 2.1
  • Operating System
    Windows XP Pro 32bit w/SP3
    Computer type
    PC/Desktop
    Manufacturer/Model
    Built by Ghot® (not in use)
    CPU
    AMD Athlon 64 X2 5000+ (OC'd @ 3.2Ghz)
    Motherboard
    ASUS M2N32-SLI Deluxe Wireless Edition
    Memory
    TWIN2X2048-6400C4DHX (2 x 1GB, DDR2 800)
    Graphics card(s)
    EVGA 256-P2-N758-TR GeForce 8600GT SSC
    Sound Card
    Onboard
    Monitor(s) Displays
    ViewSonic G90FB Black 19" Professional (CRT)
    Screen Resolution
    up to 2048 x 1536
    Hard Drives
    WD 36GB 10,000rpm Raptor SATA
    Seagate 80GB 7200rpm SATA
    Lite-On LTR-52246S CD/RW
    Lite-On LH-18A1P CD/DVD Burner
    PSU
    PC Power & Cooling Silencer 750 Quad EPS12V
    Case
    Generic Beige case, 80mm fans
    Cooling
    ZALMAN 9500A 92mm CPU Cooler
    Mouse
    Logitech Optical M-BT96a
    Keyboard
    Logitech Classic Keybooard 200
    Internet Speed
    300/300
    Browser
    Firefox 3.x ??
    Antivirus
    Symantec (Norton)
    Other Info
    Still assembled, still runs. Haven't turned it on for 13 years?
Plan B: convert your wife's boot drive to GPT using the mbr2gpt utility.

It's drastic enough that you'd want a backup of the drive, first.
 

My Computers

System One System Two

  • OS
    Windows 11 22631.2861
    Computer type
    PC/Desktop
    Manufacturer/Model
    homebuilt
    CPU
    Amd Threadripper 7970X
    Motherboard
    Gigabyte TRX50 Aero D
    Memory
    128GB (4 X 32) Kingston DDR5 5200 (RDIMM)
    Graphics Card(s)
    Gigabyte RTX 4090 OC
    Sound Card
    none (USB to speakers), Realtek
    Monitor(s) Displays
    Philips 27E1N8900 OLED
    Screen Resolution
    3840 X 2160 @ 60Hz
    Hard Drives
    Crucial T700 2TB M.2 NVME SSD
    WD 4TB Blue SATA SSD
    Seagate 18TB IronWolf Pro
    PSU
    eVGA SuperNOVA 1600 GT
    Case
    Lian Li 011 Dynamic Evo XL
    Cooling
    Alphacool Eisbaer Pro Aurora 360, with 3 Phanteks T30 fans
    Keyboard
    Logitech K120 (wired)
    Mouse
    Logitech M500s (wired)
    Internet Speed
    1200 Mbps
  • Operating System
    windows 11 22631.2861
    Computer type
    PC/Desktop
    Manufacturer/Model
    homebuilt
    CPU
    Intel I9-13900K
    Motherboard
    Asus RoG Strix Z690-E
    Memory
    64GB G.Skill DDR5-6000
    Graphics card(s)
    Gigabyte RTX 3090 ti
    Sound Card
    built in Realtek
    Monitor(s) Displays
    Asus PA329C
    Screen Resolution
    3840 X 2160 @60Hz
    Hard Drives
    WDC SN850 1TB
    8 TB Seagate Ironwolf
    4TB Seagate Ironwolf
    PSU
    eVGA SuperNOVA 1300 GT
    Case
    Lian Li 011 Dynamic Evo
    Cooling
    Corsair iCUE H150i ELITE CAPELLIX Liquid CPU Cooler
    Mouse
    Logitech M500s (wired)
    Keyboard
    Logitech K120 (wired)
Are the two computers similar? Why Win 10 was installed as Legacy - MBR on a computer has UEFI BIOS?
Are the two computers same family (Intel or AMD)?

There are two ways to convert your wife drive to UEFI - GPT from Legacy - MBR.
  • As bobkn suggested, so do I, use mbr2gpt on her drive and then upgrade to Win 11.
  • Your old SSD should boot on her computer and activated if it is same type (Home or Pro). Then you have to copy all her data to the SSD. Try to set Secure boot to off on BIOS
 

My Computers

System One System Two

  • OS
    Windows 7 HP 64 - Windows 11 Pro - Lubuntu
    Computer type
    PC/Desktop
    Manufacturer/Model
    custom build
    CPU
    i5 6600K - 800MHz to 4400MHz
    Motherboard
    GA-Z170-HD3P
    Memory
    4+4G GSkill DDR4 3000
    Graphics Card(s)
    IG - Intel 530
    Monitor(s) Displays
    Samsung 226BW
    Screen Resolution
    1680x1050
    Hard Drives
    (1) -1 SM951 – 128GB M.2 AHCI PCIe SSD drive for Win 11
    (2) -1 WD SATA 3 - 1T for Data
    (3) -1 WD SATA 3 - 1T for backup
    (4) -1 BX500 SSD - 128G for Windows 7 and Lubuntu
    PSU
    Thermaltake 450W TR2 gold
    Keyboard
    Old and good Chicony mechanical keyboard
    Mouse
    Logitech mX performance - 9 buttons (had to disable some)
    Internet Speed
    500 Mb/s
    Browser
    Firefox 64
  • Operating System
    Windows 7 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Asus Q550LF
    CPU
    i7-4500U 800- 3000MHz
    Motherboard
    Asus Q550LF
    Memory
    (4+4)G DDR3 1600
    Graphics card(s)
    IG intel 4400 + NVIDIA GeForce GT 745M
    Sound Card
    Realtek
    Monitor(s) Displays
    LG Display LP156WF4-SPH1
    Screen Resolution
    1920 x 1080
    Hard Drives
    BX500 120G SSD for Windows and programs
    & 1T HDD for data
    Internet Speed
    350 Mb/s
    Browser
    Firefox 64
Worked like a charm. Thanks. Hope you're getting paid for this.
 

My Computer

System One

  • OS
    Win 11Pro v22H2 build 22621.2428
    Computer type
    PC/Desktop
    Manufacturer/Model
    DIY
    CPU
    AMD Ryzen 9 5950X
    Motherboard
    Gigabyte X570 Aorus Pro WIFI
    Memory
    64G DDR4 3200
    Graphics Card(s)
    ASUS RTX 4070 Super OC
    Sound Card
    Soundblaster
    Monitor(s) Displays
    LG 24"
    Screen Resolution
    3480 x 2160
    PSU
    Corsair 850W
    Case
    GameMax
    Cooling
    Deepcool LT720
    Keyboard
    Corsair
    Mouse
    Razor
    Internet Speed
    Gigabyte
    Browser
    Firefox
    Antivirus
    Norton 360

My Computers

System One System Two

  • OS
    Win7
    Computer type
    PC/Desktop
    CPU
    i5-8400
    Motherboard
    gigabyte b365m ds3h
    Memory
    2x8gb 3200mhz
    Monitor(s) Displays
    benq gw2480
    PSU
    bequiet pure power 11 400CM
    Cooling
    cryorig m9i
  • Operating System
    win7
    Computer type
    PC/Desktop
    CPU
    pentium g5400
    Motherboard
    gigabyte b365m ds3h
    Memory
    1x8gb 2400
    PSU
    xfx pro 450

My Computers

System One System Two

  • OS
    Windows 7 HP 64 - Windows 11 Pro - Lubuntu
    Computer type
    PC/Desktop
    Manufacturer/Model
    custom build
    CPU
    i5 6600K - 800MHz to 4400MHz
    Motherboard
    GA-Z170-HD3P
    Memory
    4+4G GSkill DDR4 3000
    Graphics Card(s)
    IG - Intel 530
    Monitor(s) Displays
    Samsung 226BW
    Screen Resolution
    1680x1050
    Hard Drives
    (1) -1 SM951 – 128GB M.2 AHCI PCIe SSD drive for Win 11
    (2) -1 WD SATA 3 - 1T for Data
    (3) -1 WD SATA 3 - 1T for backup
    (4) -1 BX500 SSD - 128G for Windows 7 and Lubuntu
    PSU
    Thermaltake 450W TR2 gold
    Keyboard
    Old and good Chicony mechanical keyboard
    Mouse
    Logitech mX performance - 9 buttons (had to disable some)
    Internet Speed
    500 Mb/s
    Browser
    Firefox 64
  • Operating System
    Windows 7 Pro
    Computer type
    Laptop
    Manufacturer/Model
    Asus Q550LF
    CPU
    i7-4500U 800- 3000MHz
    Motherboard
    Asus Q550LF
    Memory
    (4+4)G DDR3 1600
    Graphics card(s)
    IG intel 4400 + NVIDIA GeForce GT 745M
    Sound Card
    Realtek
    Monitor(s) Displays
    LG Display LP156WF4-SPH1
    Screen Resolution
    1920 x 1080
    Hard Drives
    BX500 120G SSD for Windows and programs
    & 1T HDD for data
    Internet Speed
    350 Mb/s
    Browser
    Firefox 64
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