Booting from USB drive

  • Thread starter Thread starter JohnB
  • Start date Start date
J

JohnB

I have a 4gb portable HD that I can access when booting from a DOS floppy.

I also have a 256mb pen drive that I made DOS-bootable.

If I boot from the USB pen drive, DOS doesn't see the 4gb USB portable
drive. It DOES see it if I boot from the floppy.

Why doesn't DOS recognize the 4gb USB drive when booting from the USB pen
drive?

Thanks.
 
So far I got:
- Don't post in this forum
- No need to mult-post

Does anyone have anything helpful to offer?
 
JohnB said:
So far I got:
- Don't post in this forum
- No need to mult-post

Does anyone have anything helpful to offer?
Click to expand...

Yes - try a DOS forum as it's obviously a DOS problem - as I said, XP does
not HAVE DOS so it's NOT an XP problem!
 
JohnB said:
I have a 4gb portable HD that I can access when booting from a DOS floppy.

I also have a 256mb pen drive that I made DOS-bootable.

If I boot from the USB pen drive, DOS doesn't see the 4gb USB portable
drive. It DOES see it if I boot from the floppy.

Why doesn't DOS recognize the 4gb USB drive when booting from the USB pen
drive?

Thanks.
Click to expand...
The most likely explanation is either you don't have USB drivers installed
in autoexec.bat or config.sys on the external HDD or you do not have USB
selected as a bootable device in the BIOS or any combination
 
The most likely explanation is either you don't have USB drivers
The pen drive boots just fine. Booting from a USB HD or Pen drive isn't
the problem.

It's booting from a USB HD or Pen drive AND then seeing another external USB
drive. That doesn't work.
 
It's booting from a USB HD or Pen drive AND then seeing another external
USB drive. That doesn't work.
Click to expand...

See if your BIOS has a USB Legacy Mode. Enable it if it does.

-John O
 
Does the DOS floppy have USB drivers included on it? You may have to transfer those to the pen
drive and modify the autoexec.bat and config.sys to load those drivers for you.

Its the same as having a bootbale CD. I can make a CD bootable but if I don't also include DOS
CDROM drivers then I can't access additonal files that are on the CD besides the boot files.
 
The most likely explanation is either you don't have USB drivers installed
in autoexec.bat or config.sys on the external HDD or you do not have USB
selected as a bootable device in the BIOS or any combination
Click to expand...

Why ask here? This has nothing to do with the OS and hardware
interaction, as what you are asking about/discussing occurs before the
OS even starts to load.

Ask elsewhere.
 
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