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I am trying to create a custom bootable CentOS 7 ISO that boots from USB.

  1. I have downloaded the CentOS minimal DVD

  2. I have used dd to put the ISO onto the thumbdrive:

    dd if=CentOS-7-x86_64-Minimal-1511.iso of=/dev/sdb bs=4MB

  3. I have tried multiple options to boot from DVD like changing boot order and disabling/enabling UEFI bios but it just does not boot from the thumb drive. The ISO works fine if I burn it to DVD.

What can I do to get it to boot?

Gareth
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Youn EA
  • 21

4 Answers4

0

This process depends on the make, model, and BIOS version of the PC you are starting. For instance, on a HP Pro 6200 MT, I have to press Escape on startup in order to choose my startup disk. On many Dells, I have to press F12. The BIOS version matters - old ones may not support UEFI.

MountainMan
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0

In this instance, I would recommend using a tool such as Rufus (if you have a Windows computer available) to "burn" the image to your USB drive. I typically use that when a direct-write doesn't appear to be working, often with success.

In your case, I believe the issue is similar to that of this previously noted issue.

Community
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techjwalker
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When generating a custom centos ISO, to get it to boot in a usb stick, isohybrid required.

In my case I was using isohybrid but I the variable I was using as the iso path was wrong. As a result isohybrid was failing

Youn EA
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-1

When I first installed the (centos DVD) ISO on my usb device I formatted the drive as ext4 - I never had an issues with any other linux iso before centos.

I reformatted my usb device as FAT32 and centos started up with no issues.

Check your formatting of the drive.

Rgrauphics
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