virtualbox.org

VirtualBox 6.1
Fatal, could not read from the boot medium. system halted.
My FreeBSD VM was working fine but then it froze and after I rebooted the machine it would no longer boot. I have tried messing with the RAM and boot order but I am not sure if I have made the problem worse. I changed the settings to this and the error message has changed.
RAM:1256MB
Boot order:optical,floppy,hard disk
2 processors
BTX loader error. What is this?
I have included photos of both messages.

All the stuff in the first "ZFS" screenshot is from FreeBSD, indicating FreeBSD did boot but is having early and serious problems.

oracleboy wrote:I changed the settings to this and the error message has changed.

The second "Fatal" screenshot is an error message from Virtualbox saying it cannot find a bootable OS on the available drives. Whatever changes you made disconnected the bootable drive.

oracleboy wrote:Boot order:optical,floppy,hard disk

The VM will try the first device, then the second, then the third, to find a bootable OS. Switching this around often does not cause trouble. If you unchecked the device that contains the bootable OS, then the VM will skip that device and won't boot that OS on that device.

With the data provided there is nothing we can do to tell you how to fix this. The VM's .vbox file may help. Please right-click the guest in the main Virtualbox window's guest list, choose "Show in Explorer/Finder/File Manager". In the window that opens, zip the guest's .vbox file, and post the zip file, using the forum's Upload Attachment tab. (If you have a Windows host, please make sure all file extensions are shown, so you will be able to see the .vbox extension easier.)

At this time I cannot recreate the problem so as to supply the log file for help. I deleted the VM unknowingly thinking that thelog files would remain. Thank you for the help so far, hopefully, I can continue this thread in the future or create a new one that addresses these problems further and in more detail. Sorry about my mistakes, I'm still kinda new and am getting used to having to administrate with log files and such!

From your viewtopic.php?f=6&t=101327

oracleboy wrote:… after canceling an unsafe build of apache24 with Cntrl c and then rebooting.

ZFS is unaffected by such things. Also it should be reasonably resilient to ungraceful interruptions e.g. suddenly stopping the guest machine.

What's in your screenshots is probably symptomatic of a problem with, or affecting, your host computer. Can you describe the computer and the host OS?

Check not only the file system in which the virtual hard disk is stored; also carefully check the medium on which the file system is stored. And so on.