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Cant boot iso from flash drive (Solved)
Posted: Wed Sep 23, 2020 2:24 pm
by tosim
I placed the iso on a flash drive, first using Pentoy, secondly using MultiBoot USB. FossaPup WOULD NOT boot from iso on flash drives; it "could not find the .sfs files". Any help greatly appreciated. Thanks.
Re: Cant boot from flash drive iso
Posted: Wed Sep 23, 2020 2:34 pm
by dogFellow
FossaPup WOULD NOT boot from iso on flash drives
yeah i guess its easier to come to that conclusion as opposed to "the writing software you are using is crap"
Re: Cant boot from flash drive iso
Posted: Wed Sep 23, 2020 3:15 pm
by rcrsn51
dogFellow wrote: ↑Wed Sep 23, 2020 2:34 pm
FossaPup WOULD NOT boot from iso on flash drives
yeah i guess its easier to come to that conclusion as opposed to "the writing software you are using is crap"
There is nothing wrong with your writing software. It did its job and made a bootable flash drive.
The problem is with FossaPup's inability to find its own .sfs file on USB once the boot process has started.
Re: Cant boot from flash drive iso
Posted: Wed Sep 23, 2020 3:25 pm
by tosim
Thank you both. BTW-I've been using both of those apps since each came out, and I know they write well.
Re: Cant boot from flash drive iso
Posted: Wed Sep 23, 2020 3:34 pm
by rcrsn51
Look at the contents of the flash drive for a file like syslinux.cfg.
If it contains "pmedia=cd", change it to "pmedia=usbflash".
Re: Cant boot from flash drive iso
Posted: Wed Sep 23, 2020 3:47 pm
by dogFellow
rcrsn51 wrote: ↑Wed Sep 23, 2020 3:34 pm
Look at the contents of the flash drive for a file like syslinux.cfg.
If it contains "pmedia=cd", change it to "pmedia=usbflash".
yeah like i said the writing software is crap.
have been booting all the manual frugal installed fossapup releases from usb no problem at all
fossapup9.5 booted from usb
Re: Cant boot from flash drive iso
Posted: Wed Sep 23, 2020 11:04 pm
by tosim
Re "Look at the contents of the flash drive for a file like syslinux.cfg."-Nothing like this in either contents, but thanks for the suggestion.
Re: Cant boot from flash drive iso
Posted: Thu Sep 24, 2020 12:34 am
by bigpup
There has to be one of these files.
syslinux.cfg
grub.cfg
isolinux.cfg
menu.lst
Depending on the boot loader being used.
These files are the ones used by different boot loaders to have the boot menu entries.
If the USB flash drive has more than one partition.
Look on the first one for one of these files.
they could also be in a directory(folder) named boot or something like that.
Re: Cant boot from flash drive iso
Posted: Thu Sep 24, 2020 2:52 pm
by tosim
Thanks for the reply. On the Ventoy flash, I could find none of these files. Please see attachment bp1.On the MultibootUSB flash,please see syslcf attachment
- syslcf.png (64.82 KiB) Viewed 4513 times
.
- bg1.png (2.77 KiB) Viewed 4513 times
Once again, thank you.
Re: Cant boot from flash drive iso
Posted: Thu Sep 24, 2020 3:17 pm
by rcrsn51
So you are trying to boot directly out of the ISO file without first extracting it into the individual components?
This probably isn't going to work with your booting tools. The main Puppy .sfs file is hiding inside the ISO and Puppy can't find it when the boot process starts.
The old ISObooter tool from
here can do this.
Is this a UEFI machine?
Or this may be a timing problem with USB booting on your machine.
Re: Cant boot from flash drive iso
Posted: Thu Sep 24, 2020 4:33 pm
by tosim
Using your link-Internal Server Error. Thanks for your suggestion, anyway.
I've had almost no problems, opening the iso's over the several years I've been "distro-looking". My main drive is Linux Mint-MATE, been using Linux since 1998, and just like to checkout new arrivals. However, I really like the Puppy, and the Dog os', and over several years, have "played around" with many.
Re: Cant boot from flash drive iso
Posted: Thu Sep 24, 2020 4:38 pm
by rcrsn51
tosim wrote: ↑Thu Sep 24, 2020 4:33 pm
Using your link-Internal Server Error.
That link works OK for me. It's in the old forum.
Re: Cant boot from flash drive iso
Posted: Sat Oct 03, 2020 4:23 am
by allendiggity
Confirming this issue on two laptop systems:
Ancient HP zd8000, Not as ancient Toshiba L750. Both can boot other puppies / EasyOS from USB with no issue, but the current Fossapup 9.5 .iso drops to a grub command line as it cannot find the .sfs file on these systems. Tried with multiple USB media, written from linux with dd.
My fix: I remastered the .iso using mkisofs and isohybrid, changing occurrences of pmedia=cd to pmedia=usbflash.
Once I did that, booting worked as normal.
Re: Solved.Cant boot from flash drive iso
Posted: Tue Apr 06, 2021 12:32 am
by sebrio
I got the same problem on all my PCs. I created my USB from different software (Startup disk creator, ...) and always ended up with pmedia=cd.
The simplest solution for me was to use unetbootin: https://unetbootin.org
Re: Cant boot from flash drive iso (Solved)
Posted: Wed Apr 07, 2021 12:45 am
by Clarity
Anyone care to mention a solution for modern PUPS and DOGS that has been working flawlessly for over 18 months? Use the SG2D directions given on the 1st pages of FossaPUP64's announcement thread.
You make a USB once!
Total process for a single USB is 5 minutes to download-make the USB/DVD (this is ONLY done once for the stick or the disc). 15 seconds to copy largest of PUP or DOG ISO to the /BOOTISOS folder.
Rest is a simple: Boot, select, and you have desktop.
Works!
Re: Cant boot from flash drive iso (Solved)
Posted: Wed Apr 07, 2021 10:48 am
by sebrio
But that was my point...
When you say "You make a USB once!": I could not. I tried a lot of different ways to do just that, and they failed without feedback. The softwares I used to properly create a bootable USB based on the FossaPup64, were not doing their job, worse they were telling me the job was done properly.
I ended up thinking I had a bios problem, or FossaPup64 was not compatible with my hardware, but it took me some time to realise that my bootable USB was half bootable, and generating some strange errors saying my files were not there, even though I could clearly see them.
Hence I recommend to check on your bootable USB: your config files must not contain pmedia=cd after using whichever software you choose to create it.
Re: Cant boot iso from flash drive (Solved)
Posted: Thu Apr 08, 2021 9:54 pm
by Clarity
Hi @sebrio
This USB writing problem is an age-old problem that affects us all. It is confused by various things:
I know as I have had the same kinds of issues over the past 2 decades of USBs.
If you would like, open a thread and let see if we can get a start-to-finish set of instructions for a USB that will allow you to boot not only FossaPUP64, and also the modern PUPs.
OR post an assistance request here, and the community will aid to a solution allowing you to boot your desired PUP ISO. On my old 64bit PCs (all of my PCs are old), I have never needed to change options "CD to USBFLASH" in booting the PUPs shown above.
Hope this can lead to something simple and useful.
Re: Cant boot iso from flash drive (Solved)
Posted: Thu Apr 08, 2021 10:51 pm
by ThruHammer