For minimal CentOS 7, you can’t use easy to use programs like Rufus to create the bootable USB flash drive. They don’t have the selection. Here’s a way you can setup CentOS 7 Minimal Bootable USB Flash Drive using a terminal.

A UNIX terminal or something like Cygwin.
At least 1 GB USB Flash Drive

Cygwin Download:
CentOS Download:
Blog instructions:

1. Download CentOS Minimal in an easy to find folder.
2. Run Cygwin as Administrator.
3. On the terminal, go to the easy to find folder.
4. Put in your USB flash drive.
5. Format your USB flash drive.
6. Terminal command: ls /dev/sd
– Press tab twice
7. See what sd is at the end. Mine is sdb1, which means that we will copy the ISO to sdb.
8. Terminal command: dd if=CentOS-7-x86_64-Minimal-1511.iso of=/dev/sdb bs=8M
9. Wait and once it completes, it will say that all the bytes have been copied.
10. Reboot the computer with the USB flash drive.

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