cool info on the MBR. Thanks so much!

(would be good to know more about the usb tech specifications BEFORE buying 
that cheap stuff)

prosper FreeDOS!
Thomas

> Am 13.02.2026 um 14:25 schrieb Sabina Zelená. via Freedos-user 
> <[email protected]>:
> 
> G‎reetings.
> Yes,Rufus is good for installing FreeDOS to a flash drive/CF/SD card,etc.,it 
> contains FreeDOS,but some RDDs(flash drives/SDs/CFs) r not made successfully 
> bootable by Rufus because of a proprietary MBR from the flash drive 
> manufacturer,often designed exactly against making the drive bootable,in this 
> cases U must rebuild the terget drive's MBR & may be totally impossible,if 
> the target drive is Superfloppy with proprietary boot sector incompatible for 
> standard bootstrap.
> Usually rebuilding MBR fixes the drive to be able to be bootable,i had 
> success with Partition Guru for DOS,not very successful doing so via Windows.
> But those "some USB sticks" the problem is definitely a proprietary MBR,which 
> must be rebuilt.
> Live long & prosper.
> Sent from my BlackBerry Passport,RIM OS 10 smartphone named <b>Uhura</b> 
> after deceased Star Trek actress Nichelle Nichols.
> <b><font color="darkgreen">With regards Sabina Zelená[=Green].
> LIVE LONG & PROSPER,live & let live=DO NOT EAT,NOR WEAR ANIMALS,nor do not 
> pay Their Murderers & oppressors,please.
> Shabbat Shalom/Peace/Shanti/Mier/Nyugalom.</b>.‎
> From: Thomas Desi via Freedos-user
> Sent: Friday, February 13, 2026 10:50.‎
> To: Discussion and general questions about FreeDOS.
> Cc: Thomas Desi‎.
> Subject: Re: [Freedos-user] Fix mbr?‎
> 
> RUFUS is s good tool to format and boot FreeDOS from USB. 
> Some USB Sticks DON’T work. I have no idea why. 
> Try also different partitionings (in RUFUS possible)
> For me VERBATIM USB sticks always work.
> I can boot from one (C:) and have a second also attached, which becomes D:, 
> both work.
> 
> I had a bunch fo cheap sticks, FreeDOS doesn’t even recognise. 
> 
> good luck
> Thomas
> 
>> Am 12.02.2026 um 20:10 schrieb Jakob Stengård via Freedos-user 
>> <[email protected]>:
>> 
>> So i installed freedos on a pre-formated compact flash card.
>> As it turns out, the computer won't boot from the drive.
>> 
>> Now, i have re-formated the drive and put all the files back.
>> Can use some command on the boot disk to just write the MBR,
>> or do i need to run setup.bat and will that work?
>> 
>> I don't want to run all of the installer again, that took 3 hours last time.
>> 
>> Many thanks.
>> --
>> 
>> Med vänlig hälsning (Best Regards)
>> Jakob Stengård
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> 
> THOMAS CORNELIUS DESI
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>  
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