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How do I run memtest86+ from my USB drive?

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This FAQ applies to: Any version.

Sometimes, you need to ensure that your computer's memory is OK. You can use your Portable Linux to do that.
  1. Download a memtest86+ Linux source and binary image from the memtest site.  Extract the memtest86+ binary image named precomp.bin to a temporary folder in your computer, name it memtest.img.
  2. Download the latest SYSLINUX from here.  Then extract the file named memdisk inside the directory memdisk to a temporary directory on your computer.
  3. Plug your USB drive in.  Mount the Windows partition on your USB drive.
  4. Open the folder boot inside it.
  5. Put the memdisk file inside it.  Put the memtest image in the same folder, name it memtest.img.
  6. Now open the grub folder inside the boot folder, and open the file grub.conf with a text editor.
  7. Add the following to the end:
    title           Memory test
root            (hd0,0)
kernel          /boot/memdisk
initrd          /boot/memtest.img
  8. Use a copy of grub.conf to replace the menu.lst file in the grub folder.

Enjoy.  Next time you boot, there will be a menu entry to run the memory test.

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