panic boot error

I just wanted to try FreeBSD on my old notebook (Medion MD98300) and created a bootable dvd (FreeBSD-11.1-RELEASE-amd64-bootonly.iso)
after booting the startmenu apperars and I choose the option "Boot Multi User" and I get this error:

Code:
panic: free: guard2 fail @ 0xb474f8b0 + 8388609 from /usr/src/sys/boot/i386/loader/../../common/bcache.c:398
--> Press a key on the console to reboot <--

does anybody know what this means, and how to fix it?
 
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The checksum seems to be valid, I already tried to make a bootable usb stick by using the dd(1) command, but my notebook wasn't able to boot from this. Maybe the notebook is just too old?
 
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I tried to make a different image (FreeBSD-11.1-RELEASE-amd64-disc1.iso) on another DVD. Now it works, I don't know
why because I basically repeated the same steps. Sometimes computers are a little mystery for me.
Thanks for the advice!
 
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