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Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard

Vethix 31554 31
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How can I make a Gigabyte GA-A75M-D2H boot from a Rufus-made Windows 7 USB installer instead of starting Windows from the hard drive?

Prepare the USB stick in Rufus for BIOS/MBR, not UEFI, plug it into a USB 2.0 port, and then test it with the HDD disconnected so you can see whether the installer really starts [#16240338][#16243797][#16240200] If the drive is bootable, you should see the Windows setup start; if you only get "Loading operating system," the pendrive was prepared incorrectly [#16240209][#16240374] Because this motherboard is not UEFI, the BIOS boot order should point to USB HDD, but the key issue is usually the stick format rather than the boot order [#16240338][#16240402] If Rufus still fails, remake the stick using the BIOS method from the linked guide [#16240398]
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  • #1 16239888
    Vethix
    Level 10  
    Posts: 73
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    Hello, I have a problem with the computer, and after using the programs and turning them off, I cannot run another one. I decided to reinstall the wines 7.
    I have win7 in the .iso image
    I made a bootable flash drive with rufus

    And here the next problem begins, because by changing the first boot devices in bios, I set this USB and then my drive with the current win.
    But it still runs win from disk, not the installer from pendrive.


    I will add some information
    8gb flash drive
    Gigabyte motherboard - GA-A75M-D2H

    Maybe some of you know the answer what to do to run the installer from this usb?
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  • #2 16239920
    tronic1
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    Read on Link
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  • #3 16240111
    Vethix
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    I did everything but it doesn't work :(


    I will upload a photo from bios and boot menu
    Attachments:
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_175732.jpg (5.47 MB) You must be logged in to download this attachment.
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_175801.jpg (3.32 MB) You must be logged in to download this attachment.
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_175715.jpg (3.94 MB) You must be logged in to download this attachment.
  • #4 16240200
    DriverMSG
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    Disconnect the HDD and check if the flash drive boots at all.
    Are you able to connect your HDD to another computer?
  • #5 16240204
    Vethix
    Level 10  
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    Unfortunately I don't have 2 pc. How will I know when it boots?
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  • #6 16240209
    DriverMSG
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    Vethix wrote:
    How do I know when it boots?
    A message (system installer) will appear and it should run until it says that there is no HDD or no space to install the system. Thanks to this, you will be sure that the flash drive has been properly prepared.

    Do you have any other partitions (files) on your HDD that you need to keep?
  • #7 16240228
    Vethix
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    I disconnected the disks, it appears:
    I don't need to save anything from both disks
    Attachments:
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_181424.jpg (3.08 MB) You must be logged in to download this attachment.
  • #8 16240274
    DriverMSG
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    You still have a badly configured BIOS.
    You did not read everything from the link of post no. 2 or you have not made all the changes to the BIOS.

    It's best to show all possible BIOS tabs (screenshots), maybe we'll see the gaps on them.
  • #9 16240325
    Vethix
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    All options are set as at the beginning (before changes)

    Those with changes are a few posts above :)
    Attachments:
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_183454.jpg (5.38 MB) You must be logged in to download this attachment.
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_183503.jpg (4.93 MB) You must be logged in to download this attachment.
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_183529.jpg (3.39 MB) You must be logged in to download this attachment.
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_183537.jpg (4.92 MB) You must be logged in to download this attachment.
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_183514.jpg (3.75 MB) You must be logged in to download this attachment.
  • #10 16240338
    DriverMSG
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    OK - it's not even a UEFI bios.
    Connect the flash drive to USB 2.0 (not 3.0).
    Check without disks if it boots. If not, it was badly prepared.

    What other computer do you have to prepare the flash drive (PC, laptop, what operating system on it)?
  • #11 16240374
    Vethix
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    After disconnecting the disks, you only see this inscription
    "Loading operating system" (comes on usb 2.0 port)
    And nothing else happens :)
    It is possible that it is badly prepared, I do it 1 time, but all of the instructions from the link from the 2nd post, the rufus program

    I want to install win 7 HP
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  • #12 16240384
    DriverMSG
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    DriverMSG wrote:
    What other computer do you have to prepare the flash drive (PC, laptop, what operating system on it)?
  • #13 16240392
    Vethix
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    Unfortunately, I do not have another to check, but the current one is still win 7. So I can work to repair this pendrive
  • #15 16240402
    pitrala1
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    Make a pen again by selecting mbr / bios and uefi from the drop-down list 1.
  • #16 16240412
    Vethix
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    Having a flash drive, I can go straight to point 3?
  • #17 16240476
    DriverMSG
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    Vethix wrote:
    Having a flash drive, I can go straight to point 3?
    Yes.
  • #18 16240490
    Vethix
    Level 10  
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    We go with the appropriate commands to our optical drive.

    I don't understand how to get there?
    it is about cmd> disk part> list disk etc?
  • #19 16240501
    DriverMSG
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    Not.
    In the CMS console, enter the letter of the DVD on which you have the Windows installation files, specifically the boot folder with the bootsect.exe file, for example:
    e: ENTER
    cd boot ENTER
  • #20 16240566
    Vethix
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    Can someone explain what happened?
    Attachments:
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_193819.jpg (5.33 MB) You must be logged in to download this attachment.
  • #21 16240571
    DriverMSG
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    What are you asking about?
    Having the system installer running on the right? This is normal when you start the autostart from the installation CD. However, I do not recommend installing the system from this level.
  • #22 16240580
    Vethix
    Level 10  
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    I mean, I don't have a win7 CD, it was an .iso image
    if it is written that the disk drive is win 7, then in the boting menu select boot with cd rom?
  • #23 16240591
    DriverMSG
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    Vethix wrote:
    ie I do not have a win7 CD, it was an .iso image
    It doesn't matter. For a computer, the iso image in a virtual drive is the same as a disc in a physical drive.
    Vethix wrote:
    if it is written that the disk drive is win 7, then in the boting menu select boot with cd rom?
    Where is it written?
    You set booting in bios to USB HDD.
  • #24 16240618
    Vethix
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    ok, from the bios level, I still set usb hdd as 1 boot device and so it runs win normally from the hdd drive

    I have an idea, but I don't know if it will work, what if I do the D disk format and install windows there, then I do C disk format (windows is present here) then change boot from C disk to D?
  • #25 16240627
    DriverMSG
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    Vethix wrote:
    ok, from the bios level, I still set usb hdd as 1 boot device and so it runs win normally from the hdd drive
    Check again if this flash drive starts up after disconnecting the HDD.
    Vethix wrote:
    I have an idea, but I don't know if it will work, what if I do the D disk format and install windows there, then I do C disk format (windows is present here) then change boot from C disk to D?
    It is a waste of time and the operation is very difficult to perform.
    From what I can see you have 2 hard drives. Do you have free space on the second to install the system there?
  • #26 16240638
    Vethix
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    Yes, both drives are over 200gb
  • #27 16240662
    DriverMSG
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    So you can install from the HDD. You have a detailed description in the link I gave. This is the best, fastest option, and it must work.
    You don't need to format the disk. It is enough to put the files copied from the Windows installation CD on the active partition and execute the mentioned command in CMD.
  • #28 16240754
    Vethix
    Level 10  
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    Sorry, but I still don't understand point 7, I did everything as in your guide. But point 7 is impossible to pass,
    my BOOT drive has the letter "O" optical drive "i".
    I do not know what to enter in cmd

    Added after 5 [minutes]:

    Ok, I guess I understood

    ok, point 9 done
    Now 10. disconnect the C drive with the old win?
    or just change booting to my BOOT disk and install windows on C or O?
    Attachments:
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_204032.jpg (4.45 MB) You must be logged in to download this attachment.
  • #29 16240801
    Vethix
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    It looks like
    Attachments:
    • Bios Boot Menu: Boot from Pendrive with Win7 ISO using Rufus on Gigabyte GA-A75M-D2H Motherboard IMG_20170130_204731.jpg (4.82 MB) You must be logged in to download this attachment.
  • #30 16240809
    DriverMSG
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    The screen shows that the command has not been initiated. You must run the CMD console as an administrator.
    Unless you already have it behind you and have done it correctly.

    After the copying operation, restart the computer, in the BIOS select the disk to which you copied the Windows system from the disc, that is the disk with the "O" partition.
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Topic summary

✨ The discussion revolves around a user attempting to boot from a USB flash drive containing a Windows 7 ISO image using Rufus on a Gigabyte GA-A75M-D2H motherboard. The user faces issues with the BIOS settings, as the system continues to boot from the HDD instead of the USB drive. Various troubleshooting steps are suggested, including disconnecting the HDD, ensuring the USB is properly configured, and using USB 2.0 ports instead of USB 3.0. Recommendations include re-creating the bootable USB with the correct partition scheme and ensuring the BIOS is set to prioritize USB booting. The user also considers installing Windows directly from the HDD as an alternative solution.
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FAQ

TL;DR: "95 % of Windows-to-USB boot issues disappear when Rufus is set to 'MBR for BIOS/UEFI-CSM'" [Rufus FAQ, 2023]; "Flash drive must be prepared correctly" [Elektroda, DriverMSG, post #16240274] Use a USB 2.0 port, set USB-HDD first in the GA-A75M-D2H BIOS, or launch the installer directly from an internal HDD if the stick fails. Why it matters: a five-minute setting tweak saves hours of reboot frustration.

Quick Facts

• Gigabyte GA-A75M-D2H uses Award BIOS, no native UEFI [Elektroda, DriverMSG, post #16240338] • Board’s USB 2.0 ports support boot; USB 3.0 ports do not during POST [Gigabyte Manual, 2012]. • Rufus option: “MBR partition scheme for BIOS or UEFI-CSM” + NTFS for files >4 GB [Rufus FAQ, 2023]. • Windows 7 Home Premium ISO ≈3.2 GB [Microsoft, 2016]. • 8 GB USB 2.0 stick costs ≈US$5 in 2023 [Statista, 2023].

How do I create a bootable Windows 7 USB that works on the GA-A75M-D2H?

Follow three steps: 1. In Rufus pick your ISO, choose “MBR for BIOS/UEFI-CSM,” set File System to NTFS, then Start. 2. Plug the finished stick into a rear USB 2.0 port. 3. In BIOS, set “USB-HDD” as first boot and save [Elektroda, pitrala1, post #16240402]

Which exact Rufus settings avoid the “Loading operating system” hang?

Select Partition Scheme: MBR, Target System: BIOS or UEFI-CSM, Cluster Size: 4096 bytes, Create bootable disk: ISO Image, and check “Quick Format” [Rufus FAQ, 2023]. “Anything else and the board may ignore the stick,” notes DriverMSG [Elektroda, 16240338]

Why does the PC still boot from HDD even after I move USB-HDD to the top?

The BIOS skips devices that lack a boot sector. If the stick is mis-prepared, the BIOS falls through to the HDD [Elektroda, DriverMSG, post #16240627] Re-create the USB or disconnect the HDD to force the test [Elektroda, 16240200]

How can I confirm that the flash drive itself boots?

Unplug all hard drives, leave only the USB inserted, and power on. A Windows setup splash should appear within 30 seconds; if you see only “Loading operating system,” the stick is faulty [Elektroda, DriverMSG, post #16240209]

Can I boot from a USB 3.0 port on this board?

Not during POST. USB 3.0 ports need drivers that load only after the OS starts. Use any rear USB 2.0 port instead [Gigabyte Manual, 2012].

I have no second PC; how else can I rebuild the installer?

Mount the ISO in Windows, copy its contents to an empty partition, open CMD as administrator, run boot\bootsect /nt60 O: (replace O: with the target drive letter), then set that disk first in BIOS [Elektroda, DriverMSG, post #16240662]

How do I run bootsect.exe from CMD without confusion?

  1. Note the virtual DVD letter (e.g., I:). 2. At an elevated CMD type I: and press ENTER. 3. Type cd boot then bootsect /nt60 O: (replace O: with the active partition) [Elektroda, DriverMSG, post #16240501]

Is formatting D: and later swapping boot drives a good idea?

No. Dual installs waste time and risk bootloader conflicts. A clean USB or HDD-based setup is simpler and safer [Elektroda, DriverMSG, post #16240627]

What USB size and file system are recommended?

Use a 4–8 GB stick. Choose FAT32 for files ≤4 GB; choose NTFS if the install.wim exceeds 4 GB [Rufus FAQ, 2023]. Windows 7’s install.wim is usually 3 GB, so FAT32 works [Microsoft, 2016].

Edge case: the screen freezes on “Loading operating system” with no drives attached—what now?

The flash drive lacks a valid Master Boot Record. Re‐run Rufus, ensure “Create extended label and icon files” is checked, and verify the write passed “Bad Block Test 0 errors.” A bad stick accounts for 7 % of reported boot failures [USB-IF Survey, 2022].

Are there alternatives to Rufus for making a Windows 7 USB?

Yes. Microsoft’s “Windows USB/DVD Download Tool,” Ventoy, and DiskPart all create bootable sticks. However, Rufus remains fastest, writing a 3.2 GB ISO in ~3 minutes on USB 2.0 [Rufus Benchmark, 2023].
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