Interestingly, you can use software like 7 Zip to extract files from an ISO image. Like the analogy above, all the components to make something work is in this file, and if bootable, has a special set of code that begins to run to utilize all these components in the iso file. I know bootable antivirus programs are in an iso format. This means an iso file doesn't HAVE to be an operating system, these files are similar to a zip file but uncompressed. The box that the toy pieces come in does you no good as an actual toy but the contents inside of it, once taken out and put together, become what you're actually wanting to use. Think of an ISO file like a box that holds all the parts to something that needs to be built - like a child's toy you might buy that requires assembly. I really like this analogy from lifewire: So what do you attach to the IDE controller? I suppose the creators of this portion of VirtualBox used IDE for nostalgic purposes? Or to create a nice visual? For new students, they often confuse IDE with 'integrated development environment' programmers use to write code but this is not related at all. From there you have a running OS!Ī boot device could be a hard drive, floppy disk drive, or CD-ROM and the way we typically connect to these devices is through an IDE or SATA interface (cable if you want the eli5 version). In the old days, people would often boot a new OS from a CD, which is essentially loading whatever iso file is on that CD into RAM. The file you place or connect to the Controller: IDE is the virtual version of placing a cd in a computer, then booting up. Now in VirtualBox you'll see a Controller: SATA there as well! At first, I thought the I in IDE stood for Interface b/c that is what it is. IDE stands for Integrated Drive Electronics created in 1986 but now most computers use SATA to connect to hard drives.
What does attaching the Ubuntu ISO file to an IDE Controller mean? Everyone's answers are great, I just wanted to more specifically answer your question:
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