First of all, the boot device is an 16GB SD card. I install Citrix XenServer on it but I make the partition too small (XenServer makes a lot of logs file). I resize the partition but now it give "Illegal OpCode" and red screen everytime it boot.

I already create the image of the whole SD card using dd and already try these process three times = restore the image, test that it can boot properly, then resize the partition using gparted, then it can't boot.

I already post this question in XenServer forum (with screenshot) but nobody answer there.

The hardware itself is HP Proliant ML350 G6 with internal SD slot.

Any help will be appreciated.

I would try creating the partition first, at the size you want, then copy the XenServer image onto the card. Not sure if it's possible, but you may be able to copy the image as a file, then create a boot entry on the card that loads the XenServer image.

I have found gparted sufficiently unreliable that I do not use it any more. I may have been unlucky because when I have written that on LQ there haven't been any "me too" replies. You may be unlucky too!

+1 to what slinx wrote but try using fdisk or cfdisk to make the new partition.

Thanks slinx and catkin for the reply. I'm not at the office until next week to try cfdisk trick. Will post the result after I try it.

Tried to fix it with cfdisk with no success.
I end up installing the XenServer from scratch and successfully re-introduce the storage and all VMs (struggle a little bit with xe command).

@catkin: currently I think gparted is unreliable too. Do you have any other alternative?

Not one with all the features of gparted. I use cfdisk for changing the partition table and other command line utilities for adjusting file systems.