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I can't boot from a hard drive on usb

ar flag

My Samsung laptop came with a hard drive and I installed Ubuntu on it. Now I upgraded for a SSD that I also installed Ubuntu. I want to be able to boot from the hard drive through the USB so I can export some settings. I was able to do that on my old laptop, but here when I try with Samsung BIOS settings or f10 on boot the hard drive shuts down and the laptop restarts. I can access the hard drive contents as a mass storage device so I know it's not corrupted. On the Samsung BIOS security tab the HDD password is shown as "frozen" but the hard drive doesn't have a password, but sometimes it shows as clear but even then I wasn't able to boot.

guiverc avatar
cn flag
You've not provided any Ubuntu product/release details, but you can only boot from devices your machine's *firmware* will allow booting from. Some devices are more difficult than others (eg. I've a samsung device here I don't use in QA or *Quality Assurance* testing in Ubuntu much, as its no fun to external media from)
in flag
If the device is a spinning disk hard drive, you’ll want to also confirm that the unit is receiving enough power to handle a boot cycle. There is a lot of reading and writing going on when a machine starts up, and sometimes the power supplied by the USB port is insufficient
C.S.Cameron avatar
cn flag
Set the HDD as first boot device. Boot from the hard drive. In Terminal run: `sudo update-grub`. This will add the SSD to the HDD's boot menu. Boot may be a little slower from HDD than from SSD.
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