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Solved Can i boot an OS not listed in the windows boot manager?


Hansausage

New Member
Posts
9
#1
Yesterday, I was trying to boot the Windows 10 prerelease from an iso on my hard drive using EasyBCD. It failed to boot and i made the careless mistake of removing my main os (Windows 8.1) instead of 10 from the boot manager on windows. i'm pretty sure that windows 8 remains on my hard drive it's just not showing in my boot manager, and with that am curious if there is a way to boot windows 8.1 even though its not showing in boot manager. Thanks.
 

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    HP
    CPU
    AMD Dual Core 1.5GHz
    Memory
    8GB DDR3
    Graphics Card(s)
    AMD Radeon HD 8330
    Internet Speed
    Awful
    Browser
    Google Chrome
    Antivirus
    Windows Defender

genet

New Member
Guru
Posts
879
#2
edit:

How to use the BCDboot command in Windows 8/10 -> link
 
Last edited:

My Computer

System One

  • OS
    Windows 10
    Computer type
    Laptop
    System Manufacturer/Model Number
    Lenovo G580
    CPU
    Intel Core i5-3230M
    Memory
    8 GB
    Graphics Card(s)
    Intel HD Graphics 4000
    Browser
    Microsoft Edge
    Antivirus
    Windows Defender, standard user account
    Other Info
    UEFI firmware (BIOS) embedded Windows 8 product key.

Hansausage

New Member
Posts
9
#3
I can access the command prompt from the recovery options. Can I do this without using any installation media?
 
Last edited:

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    HP
    CPU
    AMD Dual Core 1.5GHz
    Memory
    8GB DDR3
    Graphics Card(s)
    AMD Radeon HD 8330
    Internet Speed
    Awful
    Browser
    Google Chrome
    Antivirus
    Windows Defender

genet

New Member
Guru
Posts
879
#4
I can access the command prompt from the recovery options. Can I do this without using any installation media?
Yes.

diskpart
list volume Note: Note the volume letter where the Windows 8 is installed.
exit

bcdboot X:\windows Note: Replace "X" with the volume letter of the Windows 8 partition.

edit:

bcdboot.png
 
Last edited:

My Computer

System One

  • OS
    Windows 10
    Computer type
    Laptop
    System Manufacturer/Model Number
    Lenovo G580
    CPU
    Intel Core i5-3230M
    Memory
    8 GB
    Graphics Card(s)
    Intel HD Graphics 4000
    Browser
    Microsoft Edge
    Antivirus
    Windows Defender, standard user account
    Other Info
    UEFI firmware (BIOS) embedded Windows 8 product key.

Hansausage

New Member
Posts
9
#5
Thanks! I'll try this when I get home tonight.
 

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    HP
    CPU
    AMD Dual Core 1.5GHz
    Memory
    8GB DDR3
    Graphics Card(s)
    AMD Radeon HD 8330
    Internet Speed
    Awful
    Browser
    Google Chrome
    Antivirus
    Windows Defender

strollin

Old Guys Rule!
VIP Member
Pro User
N. Calif

Posts
3,650
#6
Hope you are successful at getting your Win 8.1 added back to the boot menu. I'm sure that is the solution you are looking for.

However, to answer your original question of "Can i boot an OS not listed in the windows boot manager?" the answer is, yes. You should be able to bring up the Boot Options dialog of your motherboard and select which drive to boot from just as if you wanted to boot from a CD or USB drive.
 

My Computer

System One

  • OS
    W10 Pro (desktop), W10 (laptop), W10 Pro (tablet), W10 (laptop)
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    Home built i7-8700K, Toshiba Satellite S55-A Laptop, MS Surface Pro 3, Dell Inspiron 15 5000
    CPU
    3.7Ghz Core i7-8700K, 2.4Ghz Core i7-3630QM, 1.9Ghz Core i5 4300U, 2.8Ghz Core i5 6200U
    Motherboard
    ASUS TUF Z370-Pro Gaming, Toshiba, MS, Dell
    Memory
    16G, 12G, 4G, 8G
    Graphics Card(s)
    Nvidia GTX 1050, Intel HD Graphics 4000
    Sound Card
    ATI High Definition Audio (Built-in to mobo)
    Monitor(s) Displays
    Dell S2817Q 28", 15.6"
    Screen Resolution
    3840x2160, 1366x768 (laptop)
    Hard Drives
    500GB ssd boot drive with 2 & 10TB Data on Desktop, 512GB ssd for laptop, 128GB SSD tablet, 500GB ssd laptop
    PSU
    Corsair CX 750M
    Case
    Antec 100
    Cooling
    Coolermaster CM 212+
    Keyboard
    IBM Model M - used continuously since 1986
    Mouse
    Microsoft IntelliMouse
    Internet Speed
    120Mbps/6Mbps down/up
    Browser
    FireFox
    Antivirus
    MSE on desktop, Defender on laptop
    Other Info
    Retired after working in the tech industry for 41 years. First 10 years as a Technician, the rest as a programmer/software engineer. After 1 year of retirement, I was bored so went back to work as a Robotic Process Automation Consultant.

Hansausage

New Member
Posts
9
#7
Thanks, everything's running fine now :)
 

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    HP
    CPU
    AMD Dual Core 1.5GHz
    Memory
    8GB DDR3
    Graphics Card(s)
    AMD Radeon HD 8330
    Internet Speed
    Awful
    Browser
    Google Chrome
    Antivirus
    Windows Defender