It may also show you a different number of elements, it depends on the number of partitions you (or your OS installer) have created originally…Ģ. Please Note: It may also show your other hd (like, for example hd1 etc… but we generally consider only hd0 for boot purposes, unless you have done a different configuration when installed your HD, OS and/or configured your BIOS) OR (if you have a modern partitioning set) (hd0) (hd0,gpt6) (hd0,gpt5) (hd0,gpt4) (hd0,gpt3) (hd0,gpt2) (hd0,gpt1) (If you have an old partitioning set) (hd0) (hd0,msdos5) (hd0,msdos2) (hd0,msdos1) This command should display an output similar to the following: To find the boot partition you’ll have first to execute the ls command as follow (if you are not familiar with grub then please note “grub rescue>” is grub rescue mode prompt):.To fix it the first thing you’ll need to do is to find which partition on your disk contains the boot partition for your other Operating System (let’s say, for example, Linux). Your grub boot sequence have been screwed up by Windows update process. If, after Windows updates, you reboot your system and get this error message: error: unknown filesystem With that said my apologies to Microsoft for being so direct, but there is really no other way to clarify this.

These should be possible even on secure-boot configured systems. If Windows really need to alter temporarily it’s boot process they can either use UEFI or alter the process within their boot partition. There is no need to break grub boot loader when updating Windows, so it’s just another buggy behaviour of Windows. This is not an attack on Microsoft, I personally don’t have any problem with them but after so many years using their products (mostly Windows) I have come to the conclusion they have lost control of most of their code and simply cannot cope with all the challenges they have to face every day. Simple, Microsoft code quality is very low, extremely buggy and insecure. Why does Microsoft Windows tend to break my dual boot when updating?

Grub on usb breaks grub on system