![]() What makes these SW's annoying (easeus.) is that they claim to do this "sector by sector". Maybe Macrium is actually just being polite - in contrast to for instance EaseUS and AOMEI, that is seeing the USB-connected disk, but don't make a "true clone-copy" of the disk. It can make rescue disk and backup and restore to USB drives. only difference is that this is 1) a Linux "flavour like thing", that is made for 2) Raspberry-Pi, and placed on a 3) microsd card (the microsd card is the "boot disk", on a RaspberryPi).You're right, I don't dabble in RaspberryPi and no, MR can't backup from USB sticks or microSD cards. Systems that we normally place on a SSD/HDD (a "boot disk"). And, by "system" I mean the ones like "Windows, Linus Ubuntu, etc. so in contrast to the commonloy used cloning-SW's, Macrium doesn't at all seem to support cloning miscosd cards).Īnd, I am talking a full system (that Macrium cannot see + the microsd-card the system is placed on!). no matter if it is placed on a SSD, HDD og microsd-card (I have tested several these days. Independent from perhaps other uses of the terms.Your question indicates, that you don't know the Raspberry-Pi? Am I wrong here?Īnyway, a normal disk/partition Backup/PartitionManager recognizes a usb-connected drive. are completely defined and have mathematical meaning. So we see with complete certainty that "kernel" and "image" of an O.S. We can see that if we choose the original set to be finite sequences of binary or 1's and 0's and the codomain (set mapped to) to be also sequences of binary, then we can construct such things if and only if, a suitable group structure can be defined (this little bit in depth and unrelated to question asked). So for example there may be multiple elements from the kernel that map to the image and we already know they all have to map to 0. If the image is smaller in size then the original set then we can see multiple items must map to one single element. Basically the elements that map to 0 like thing in the image. Kernel - Basically just the elements from the original set that map to the image, but only map to the identity element in the image. The function may not map to every single element and those elements would not be included in the image. ![]() Image - The image of a group homomorphism and in general functions and maps, are just a subset of some set, who's elements actually get mapped to. You can see it may be in one's favor to map the set to a smaller set or a subset of some set where the subset is smaller. If you have a set which represents some level of information about the "complete" O.S., if that information also forms a group then you can define group homomorphism's on that set or basically maps to other sets having different sizes then the original set so long as they "respect" the orginal set's structure that made it a group. Considering Unix was derived in an academic environment it may be possible that it's use of these word's kernel and image are the same. I'm certain these names derive from mathematical concepts as they are related significantly in various fields in mathematics. In math the kernel is the inverse image of a subset of the image of a some map, were the subset is equal to the identity element in the codomain. After that, the bootloader loads the kernel image by replacing itself with the extracted contents of that file. ![]() This is represented by the different stages in grub. grub then has its own mechanism how to fully load itself by loading other images. This is also a representation (image) of the earliest state where grub is able to load the rest of itself. If you dump that to a file it would then be an image in form of a file not rawly written to disk, but rawly written in a file. That boot.img is not a file (if grub is installed) it is the name for the part that is in the Master Boot Record (MBR). The BIOS loads the bootloader that is also an image, for example called boot.img in case of grub. Or if a smaller program (chain-)loads a more complex one, it is called bootstrapping. The booting process of a computer does that several times until the operating system finally runs. Nowadays, the bootloader loads such an image from the hard disk’s filesystem (driver is needed), replaces itself with it and so gives the control to it. So the Linux kernel image is an image (a picture of the state) of the Linux kernel that is able to run by itself after giving the control to it. That program can then start running from that state in a consistent manner. Just as a photograph represents the reality exactly as it was when shooting, an image of an executable program (or kernel) represents the program in a state, where it can be loaded (or unpacked) in the systems memory exactly as it is and then given control to it. ![]() It doesn't mean an "image" is just a 1:1 copy of a disk. ![]()
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