QEMU on MacBook Pro to boot bootable usb Linux flash drive

[msg board]

Hi,

I m using qemu-system-x86_64 on MacBook Pro running Catalina 10.15.2

I have a bootable Linux usb flash drive which I connect to my MacBook and it enumerates as /dev/disk2 and mounts on /Volumes/NO NAME.

I want to use qemu on my MacBook to boot this disk. 

I used many combination of commands but I keep getting errors.

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e.g. when I used “sudo qemu-system-x86_64 -hda /dev/disk2” command from command line, I get error on command line saying “ WARNING: Image format was not specified for '/dev/disk2' and probing guessed raw.

Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.

Specify the 'raw' format explicitly to remove the restrictions.”

On qemu window I see “Booting from Hard Disk...  Disk error  Press any key to restart”

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So I run “sudo qemu-system-x86_64 -hda /dev/disk2,format=raw” and the command line shows “ qemu-system-x86_64: -hda /dev/disk2,format=raw: Could not open '/dev/disk2,format=raw': No such file or directory” and qemu does not start.

Any insight is greatly appreciated

Thanks