Hi, I also face this kind of error while installing centos from usb drive and when I select it uefi mode in bios its got resolve the issue and finally i am able to install centos from usb drive. Regards, Sahil | 9930870258 On Mon, Dec 14, 2015 at 5:30 PM, <centos-virt-request at centos.org> wrote: > Send CentOS-virt mailing list submissions to > centos-virt at centos.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.centos.org/mailman/listinfo/centos-virt > or, via email, send a message with subject or body 'help' to > centos-virt-request at centos.org > > You can reach the person managing the list at > centos-virt-owner at centos.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of CentOS-virt digest..." > > > Today's Topics: > > 1. boot thumbdrive with CentOS 7 ISO??? (ken) > 2. Re: [CentOS] boot thumbdrive with CentOS 7 ISO??? (ken) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 13 Dec 2015 16:48:25 -0500 > From: ken <gebser at mousecar.com> > To: CentOS mailing list <centos at centos.org>, centos-virt at centos.org > Subject: [CentOS-virt] boot thumbdrive with CentOS 7 ISO??? > Message-ID: <566DE7A9.9060307 at mousecar.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > The big picture is I'm wanting to boot centos 7 and install kvm. > > 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 wrong. > > I tried all three methods below as root using CentOS 5.11, copied it to > the thumbdrive with: > > dd if=CentOS-7-x86_64-Everything-1503-01.iso of=/dev/sda bs=1024 > > (Tried this because some webpage said) > > isohybrid CentOS-7-x86_64-Everything-1503-01.iso > > dd if=~CentOS-7-x86_64-DVD-1503-01.iso of=/dev/sda > > None of these successfully booted. Instead they ignored the flash drive > as it wasn't there. > > Documentation in various webpages I found gave different recipes for > creating the thumbdrive contents (many of which didn't make sense to > me). Does anyone have experience with success with this...? > > Thanks much. > > > PS. Also in the BIOS, should I enable Virtualization Technology? I'm > sorting guess I should. The Windows docs recommend not to. I'm > thinking though it would be preferred for KVM. What's the certain verdict? > > > ------------------------------ > > Message: 2 > Date: Mon, 14 Dec 2015 04:30:08 -0500 > From: ken <gebser at mousecar.com> > To: CentOS mailing list <centos at centos.org>, centos-virt at centos.org > Subject: Re: [CentOS-virt] [CentOS] boot thumbdrive with CentOS 7 > ISO??? > Message-ID: <566E8C20.6080701 at mousecar.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > 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 > >> wrong. > > > > 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 > > set. > > 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 > Troubleshooting --> > > [use 'e' or 'c' keys] > > regardless of which of the above three I selected via right-arrow, I was > prompted by: > > 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? > > > > ------------------------------ > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt at centos.org > https://lists.centos.org/mailman/listinfo/centos-virt > > > End of CentOS-virt Digest, Vol 100, Issue 12 > ******************************************** > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20151215/d8bb8bbe/attachment-0004.html>