[Solved] Unable to boot from USB (that is a copy of the DVD)

[phl]

Hello,

I got the DVD.iso, then dd if=DVD.iso of=/dev/usb_flash_key. This will create 3 partitions on the USB key :

Code: Select all

#         Start          End    Size  Type            Name
 1         2048       411647    200M  EFI System      EFI System Partition
 2       411648      1435647    500M  Microsoft basic 
 3      1435648     15677439    6,8G  Linux LVM       

Then I try to boot (via UEFI), the boot menu gives me 3 entries for my flash disk.
I try the 3 entries :

1. list of 3 kernels (3.10.xx, therefore I am booting a Centos 7 not a Centos 6.5), then I choose one, then I got:
   • - failure reading sector xxx from hd5
     - no such device uuid number
     - you need to load kernel first
2. goto into grub shell. Then, I type the ls command and the grub says there is trouble to access to hd5 (error failure reading sector xxx from hd5)

Does I do a extra configuration on the SUB flash drive after the dd command ?

Thanks,
PHL.

[gerald_clark]

Show the actual commands you used when copying to the flash key.
/dev/usb_flash_key is NOT your flash key.

[TrevorH]

I suspect your USB key is corrupt,. Try dd'ing it back to a disk based file and md5sum the resulting image and see if it matches the original.

[phl]

You have right, the USB Flash key was corrupted.

I "dd" again the same iso on another key and every thing is OK.

Thanks,
PHL.