> On May 4, 2025, at 4:49 AM, Eric Auer via Freedos-devel > <freedos-devel@lists.sourceforge.net> wrote: > > > Hi Jim, > >> As a test, here's the same experiment with a 30MB disk image. Again, >> it doesn't work with T2505 USB "Full" but does work with T2505 USB >> "Lite": > > So you get two cases where, using the same kernel AND format > versions, it makes a difference from which USB you boot? > > Can you look for fdisk /info, /dump and /status differences or > other information about how the two USB images differ in their > boot styles? For CD/DVD, I would have said one might have used > ElTorito images and the other Syslinux/Isolinux MEMDISK, but I > do not expect 2 USB images to differ from each other that way?
The USB images are simply hard disk images. They contain a MBR and partition table along with a primary DOS partition. They rely on the BIOS seeing the USB drive as a hard drive and booting it. > > Alas neither fdisk /info nor /status nor /dump in FreeDOS will > show details about reported LBA and CHS geometry, drive numbers > and similar BIOS information, but I would habe been interested > in exactly such things when it comes to thinking about why one > USB boot image behaves different from another. > > Maybe you can use different tools for those comparisons? > > Thanks! Regards, Eric > > > > > _______________________________________________ > Freedos-devel mailing list > Freedos-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-devel _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
