[Bug 242341] GEOM / GEOM_PART: silent discard MBR modification

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242341

--- Comment #3 from Tomasz "CeDeROM" CEDRO <tomek at cedro.info> ---
Hello Andrew! :-)

Thank you for your reply. There is a discussion on a mailing lists (questions
andusb), where some folks say this is the pendrive problem, others suggest that
invalid MBR may be the reason of discarding writes to MBR.

I think here is the best place to ask questions and solve the issue directly
with authors :-)

1. I would like to clarify why I was unable to write to MBR (first 512 bytes)
of the da1 while there was no problem with writhing to the rest of the disk?

2. GEOM_PART: integrity check failed (da1, MBR) <- could that block / discard
writes to MBR silently?

3. Why `dd if=/dev/da0 of=/dev/da1` did copy all disk except the MBR?

4. Why I was unable to write to MBR from a file but it was possible to write
that data from a file over md0?

This is the first time such situation happened to me in FreeBSD for many many
years. I am working a lot on disk copies / images so reliable and trustworthy
DD is a must have for me..

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