In order to install Debian from a bootable USB drive, the procedure is: format a thumb drive to FAT32, determine the thumb drive location as /dev/sdX, and run commands of the form
sudo dd if=debian-9.2.1-amd64-DVD-1.iso of=/dev/sdX bs=4M sudo sync after downloading the appropriate ISO file from https://cdimage.debian.org/debian-cd/current/amd64/iso-dvd/ One can usually install Debian using only the first of the ISO files (in this example, debian-9.2.1-amd64-DVD-2.iso and debian-9.2.1-amd64-DVD-3.iso are typically unnecessary). But it would be nice to have these files available for installation, especially on a machine with a slow Internet connection. Assuming the bootable USB drive has enough capacity, as most do nowadays (13 GB should suffice), can the second and third ISO files be saved to the same USB drive? Does one need to partition the drive and save the extra ISOs to the partition, and is this done after first running the dd command above? During installation, will the installer ask one to insert the (supposed) DVDs with the second and third ISOs at some point; if so, how does one direct the installer to the ISO images on the USB drive? --G.M.
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