[CentOS-virt] [CentOS] boot thumbdrive with CentOS 7 ISO???
gebser at mousecar.com
Mon Dec 14 09:30:08 UTC 2015
On 12/13/2015 05:00 PM, Frank Cox wrote:
> On Sun, 13 Dec 2015 16:48:25 -0500 ken wrote:
>> So far I've created on this new laptop a big, empty partition; in
>> the BIOS enabled legacy booting and disabled UEFI; also in BIOS
>> under Legacy Boot Order set "USB diskette on key/USB hard disk" on
>> second priority. I've tried to boot from a usb thumbdrive three
>> times and it failed all three times. I'm not understanding what's
> I install Centos on pretty much everything by setting the bios to use
> USB as the primary boot device, then booting the Centos Live Image
> from a flash drive, then hitting the "install to hard drive" icon on
> the Live Desktop. After the installation is complete, set the bios
> back to use the hard drive as the primary boot device and you're all
Aha! The problem was that, despite legacy was enabled and uefi was
disabled, the bios followed 'uefi boot order' and disregarded 'legacy
boot order'. Once I changed uefi boot order appropriately, the bios
booted the thumbdrive.
However, when the centos menu came up, i.e.:
Install CentOS 7
Test this media & install CentOS 7
[use 'e' or 'c' keys]
regardless of which of the above three I selected via right-arrow, I was
error: invalid magic number.
error: you need to load the kernel first.
Press any key to continue...
I tried also using the 'e' and 'c' keys off this menu; this brought into
other menus (which are too much to type up) and on another menu where ^E
and ^X can be used to 'edit' and 'execute' boot statements, none of
which works correctly or is obvious what to alter or enter.
I also got into an interface with a 'grub>' prompt. I tried some of the
grub commands, but had little clue what to do with that. E.g.,
"linuxefi /isolinux/isolinux.bin" returned "error: invalid magic
number." Interesting, but not getting CentOS 7 booted.
Any know what else is possible?
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