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installation from USB w/ multiple ISOs?

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


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?


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