Let us assume your USB is identified as sde (change as needed for your system), then copy and paste the appropriate line for your kernel: If the graphic USB creators fail, use one of the command line options below as Root.If you want to create a USB on a Windows base, we suggest you use Rufus, which supports our bootloader. Other graphical USB creators that write a Read-Only image of the ISO onto USB (e.g., openSUSE Imagewriter or Mint USB Image Writer) may also be used to create a Live USB, but it will lack the advanced live features available to MX.Users of other Linux distributions can download and run our Live USB Maker appimage right from their current distro to create a full-featured Live MX USB from any standard ISO. A full-featured bootable (Live) USB can be made from an ISO by using MX’s Live USB Maker tool.Now i'm just need to wait for my "default route not set" issue before i can actually try OPNSense.Verification checksu m and signatures are listed on the Download Mirrors page. GPT Header as it exists on disk after writing The recalcuated checksums are correct, and the image boots.į1 99 FF E9 A2 3F E7 11 90 3F 00 0C 29 54 E1 33ĬRC-32 checksum of partition entries array That's something probably in OPNSense's control, solves the issues, and gets people up and running. My suggestion: have it be 4 GPT partitions rather than 3. It also has the ability to calculate CRC-32 of selected bytes. HxD lets you open a physical disk and hex edit it. What I did was use the free hex editor HxD to manually calculate the two CRC32 checksums. Lets see who stands up the point fingers. GptBoot should boot a perfectly valid disk (the UEFI said so). Windows should calculate the CRC correctly. FreeBSD should simply say they have 4 partition entries rather than 3. FreeBSD's gptboot refuses to boot the disk as presentedĮvery image writer, writing a GPT disk without correcting the GPT backup sector, is doing it wrong.Windows outputs an invalid checksum (because it assumes everyone makes their partition entries a multiple of the sector size).FreeBSD doesn't use a number of partition entries that makes them a multiple of the sector size.USB image writers do not output a valid GPT disk.GptBoot just had to be a jerk and reset the machine rather than continuing. This is after it already did boot - the UEFI BIOS transferred control to gptboot. When Windows 10 recalculates the CRC-32 of all the partition entries, it calculates it wrong.Īnd refuses to boot. GPT header has a checksum of itself ( 0xDC779EC2 0xAE3C7980)Īnd that would have been fine. ![]() GPT header indicates the sector that contains the backup GPT Header (Sector 1,857,314 62,652,415).GPT header has a checksum of all the partition entries (0xB6E18EEF).When it does so, it needs to update the checksum of the GPT header (because we're changing the value that indicates the sector that contains the backup header): It detects that there is no backup GPT Header in the (empty) final sector, and creates one. Rufus, physdiskwrite, etcher, Win32DiskImager) finish writing your image and close the physical disk handle, something deep inside Windows checks that you didn't fuck up the disk. But other than that, it's not catastrophic. FreeBSD will actually check that the backup exists, and give you a warning if it doesn't. The UEFI BIOS reads the GPT Header, and transfer boot control to the active partition. In reality this normally doesn't cause any problems. ![]() ![]() You've just written out an invalid GUID-Partition Table disk: the backup GPT Header in the last sector is missing. Sector 62,652,415: Empty (Last sector of the drive which should, but doesn't contain the backup GPT).Sector 1,857,314: Backup GPT Header (from the image not really the last sector of the drive).When you copy that to a real 32GB USB stick, you have a problem: ![]() The last sector of your physical device doesn't contain the required GPT backup copy. DD) a GPT image to a new disk is: you just created an invalid disk. The important point here for people trying to blindly copy (i.e. That means that in your image it is sector 1,857,314 that contains the backup GPT Header: If for example your OpnSense USB image is only 900MB (950,943,744 bytes) long, it is sector 1,857,314 that is the last sector.
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