I have a USB stick supposed to be bootable, but the computer does not boot it. I suspect that there is no MBR (Master Boot Record).
How do I test if this is so, preferably from command line in Linux.
You can inspect this with
Then you've got the bootsector in
You can also inspect the file manually with
You can use TestDisk (free, open source, and cross platform) to do this. It can scan any drive you want, and analyze the partition layout (or you can specify it and it will try to search for partitions in the layout style you choose). TestDisk can also overwrite the MBR on a disk with the one you choose.