Differences Between DVD/CD Boot and USB Boot

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USB booting and CD/DVD booting differ significantly in their processes and user experiences. When booting from a CD/DVD, the system prompts the user to press a key to initiate the installation before logging into the operating system. This allows for immediate access to the installation environment. In contrast, booting from a USB drive may not provide an initial notification, as the USB is recognized by the BIOS as a storage device similar to a hard drive. Consequently, users may need to log into their operating system to access the setup files on the USB drive and initiate installation, which is not the case with CD/DVD booting. This behavior is normal and reflects the inherent differences in how BIOS interacts with these types of media during the boot process.
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What are the differences between USB Boot and CD/DVD Boot. I am confused when booting from USB. My BİOS setting is set up for Legacy Mode and USB Boot but now something is different from CD/DVD boot. In DVD boot we restart PC it gives a notification at the start as push a key. Without logging in we can do the installation. But in USB case, I don't take any notification. After loggin in, under my computer I access to the setup file in the USB. The I start installation. Is this normal? Should it have been like in the case of DVD boot i.e not logging in?
 
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