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I created a CentOS bootable disk for installing CentOS onto my external hard drive. I was successful on installing it onto a partition created for the same on the external hard drive, but when I tried to start the machine to boot from the external drive, it failed to boot into CentOS. I changed the boot order as well, I'm using a Lenovo P52. Could anything be done to solve this?

  • Your boot disk (internal to your laptop) has a boot loader/boot manager that knows what partitions are avail. to boot your machine. This is probably either GRUB/GRUB2(linux) or BCD(windows) When installing CENTOS to the external drive, WHERE did the boot record get written? Also.. what is the OS hosting the boot loader? – Señor CMasMas May 28 at 18:39

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