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I'm trying to make a DOS Boot Disk on a USB stick using a Mac. I don't really care if it's MS-DOS or FreeDOS, as long as I can use it to flash a faulty BIOS on a X9DRL-iF from SuperMicro.

I don't want to boot a Mac, and I don't want Linux.

To see first if the boot stick works I'm trying to boot an old test PC made of a Gigabyte card and a Core 2 Duo proc.

I've tried different combinations of Unetbootin, dd of the Freedos FullUSB IMG, nothing worked. I'm always stuck on that screen (pic included).

Any ideas?

enter image description here

brunobhr
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  • Does this answer your question? [how can I make a USB stick bootable in EFI](https://superuser.com/questions/369874/how-can-i-make-a-usb-stick-bootable-in-efi) – harrymc Jul 07 '23 at 13:09
  • Sorry not at all, I don't want to boot a Mac, and I don't want Linux. Thanks anyway – brunobhr Jul 07 '23 at 14:16
  • That's not what [this answer](https://superuser.com/a/1284730/8672) is about. Read it. – harrymc Jul 07 '23 at 14:22
  • You meant using Etcher instead of Unetbootin or dd? I did and I still can't boot, get the same screen. I'm flashing FD13FULL.img. Thank you. – brunobhr Jul 07 '23 at 14:37
  • Your problem might be that you're creating an EFI boot, which DOS doesn't support. – harrymc Jul 07 '23 at 14:46
  • No, /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *15.5 GB disk2 1: Windows_FAT_16 FD13-FULL 536.7 MB disk2s1 – brunobhr Jul 07 '23 at 14:49
  • I'm just flashing FD13FULL.img on a MBR/FAT usb drive. I've tried dd, Unetbootin, and now Etcher. – brunobhr Jul 07 '23 at 14:50
  • The bootstrap should be in the image, then written when flashed,making the FAT partition bootable, or am I wrong? – brunobhr Jul 07 '23 at 14:54
  • No, the boot sector needs to be added. Usually "bootable" is a parameter of the flashing program. – harrymc Jul 07 '23 at 14:59
  • Or did I understannd your comment the other way around, as in I am trying to boot with the BIOS set to UEFI? I'm confused. – brunobhr Jul 07 '23 at 14:59
  • Anyway there is no such option in Etcher. – brunobhr Jul 07 '23 at 15:01
  • Try Rufus. See also this [post](https://superuser.com/questions/1688959/clarification-on-using-rufus-to-create-a-bootable-live-freedos-usb-drive). – harrymc Jul 07 '23 at 15:07
  • I do not have Windows – brunobhr Jul 07 '23 at 15:56
  • So it is, my bad. – Jiminy Cricket. Jul 07 '23 at 18:12
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    "I do not have Windows:" Use a VM, if it makes it easier. Recently I wanted to run a 32-bit Windows program to have it create a bootable *32-bit OS* USB drive. After spending hours trying numerous ways, I used Oracle's *VirtualBox*, which took about 1/2 hour to set up, run the 32=bit app, and make the USB drive. Any VM should work. Disadvantage: VM saved to disk take up 40 GB, if you care to keep it. – DrMoishe Pippik Jul 07 '23 at 18:12
  • Pippik, I seen that route and found it an overkill. What seemed like a trivial question ended up being a black hole. I've done hundreds of MacOS or UX/Linux boot devices and never struggled like with this DOS thing. Also I am totally MS-DOS/Windows illiterate, hence my question here. Thanks – brunobhr Jul 07 '23 at 18:18
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    Involved but necessary is not overkill. That is the correct way to accomplish this, especially considering the things you've already tried. DrMoishe has provided a likely solution; I suggest you try it rather than dismissing it. – music2myear Jul 19 '23 at 05:28

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