Mirror disk followed by mount error 19
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 Hi, I tried to mirror a pfSense disk but something went wrong. 
 And now the original disk won't boot anymore.The error is: 
 GEOM_MIRROR: Force device pfSenseMirror start due to timeout.
 GEOM_MIRROR: integrity check failed (mirror/pfSenseMirror, MBR)
 Mounting from ufs:/dev/ufsid/ <a long="" id="">failed with error 19.Then I'm dropped a the mountroot prompt. mountroot> ? 
 List of GEOM manged disk devices:mirror/pfSenseMirror ada0 Now, is there a way to check whether the disk still has the pfSense installation files? 
 And I will just have to fix the bootloader? 
 
  
 </a> 
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 Hmm, what did you do to create the mirror? Did it appear to succeed? Try running at the mountroot> prompt: ufs:/dev/ada0s1aIt could be just the geom label that's missing. Steve 
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 ufs:/dev/ada0s1a would return Mounting from ufs:/dev/ada0s1a failed with error 19.What I'm trying to avoid is a fresh install. 
 But I have the config.xml backed-up so I think I'll go that way.The story is that I booted the pfSense usb media, selected Setup GEOM Mirror. 
 The it appeared that the mirror operation went well.
 However after reboot, I got the error.
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 It only shows one disk in that output. Maybe one of your disks failed? Though it should still boot from the remaining disk, perhaps it also has an issue. A reinstall here would be safer than trying to recover. Replacing the disk(s) and reinstalling would be safest. 
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 Ran into the same error when trying to install pfSense (current version 2.3.4) to a new embedded appliance (IBOX-501 N10/Protectli type device) with SSD or CF from a USB or CDROM. Cause of the issue is related to GPT (GUID Patition Table) marked media, and can affect either the new SSD, CF and/or the USB install media. Using Windows, this is how I was able to correct the issue. Using Windows 7 PC with administrative rights - Connect SSD or CF media to the Windows PC
- Open a command prompt (with admin rights)
- Start the DISKPART utility by typing DISKPART
- type LIST DISK and note the number of the drive that will contain the pfSense installation
- type SELECT DISK (number)
- type CLEAN and wait for the task to complete
- type CONVERT MBR and wait for the task to complete
- type EXIT
- remove the SSD or CF drive
 Seems that some USB thumb drives are shipped from the factory with GPT instead of MBR. If installing pfSense from a USB drive use the same steps above to prepare the USB media. Seems SanDisk and some Corsair USB drives are shipped from the factory with GPT. After completion, a USB drive can be set up to install pfSense using Rufus. 

