clarification on the cloning process.  The cloning was done a different computer.   It was done on a computer running 
RHE 8.  This way the compact flash cards are not "in use".

Is it at typing error or did you really use “if=" twice when writing back to the device?

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From: community-noreply@qnx.com
Sent: 14 January 2022 20:00
To: ostech-core_os@community.qnx.com
Reply to: ostech-core_os@community.qnx.com
Subject: Failed dd clone of compact flash


I tried using dd to clone the compact flash
dd if=dev/sda  of=/image.img<http://image.img>;  # copy original compact flash to a file
dd if=/image.img<http://image.img>; if=dev/sda    #copy file to target compact flash

but when I use the cloned compact flash I get an error that it can't read(?) the mounted drive:
mount -tgnx6 /dev/hd0t179 /d0
  mount: can't mount /d0 (type qnx6)
  mount: possible reason: read only file system.

What am I missing when making the clone?



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> I tried using dd to clone the compact flash
> dd if=dev/sda  of=/image.img  # copy original compact flash to a file 
> dd if=/image.img if=dev/sda    #copy file to target compact flash
> 
> but when I use the cloned compact flash I get an error that it can't read(?) 
> the mounted drive:
> mount -tgnx6 /dev/hd0t179 /d0
>   mount: can't mount /d0 (type qnx6)
>   mount: possible reason: read only file system.
> 
> What am I missing when making the clone?

I'm not sure if this will help but when I get this message it is invariably when using a QNX6 file system on a USB drive
. I don't know is a similar approach needs to be taken with your flash drive. I have used compact flash with QNX6 
however with no such problems.

The way I fixed it (in QNX7) was by mounting as follows:

mount -t qnx6 -o sync=ignore /dev/usb0t177 /usb    (for example)

This allows me to write to the USB drive. Otherwise it's read only.

I imagine something like this might work for you:

mount -t qnx6 -o sync=ignore   /dev/hd0t179   /d0