[Bug 253874] dd bs= arg variants

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253874

            Bug ID: 253874
           Summary: dd bs= arg variants
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Website
          Assignee: doc at FreeBSD.org
          Reporter: bruce.lilly at gmail.com

https://docs.freebsd.org/en/books/handbook/bsdinstall/#bsdinstall-pre
Specifically, section 2.3.1.1.

There is considerable verbiage about syntax variations and "1m" vs. "1M".
As the unit for bs is bytes, it would be simpler to specify bs=1048576,
which will work with all dd variants.

As an aside, it could be pointed out that 1048576 is 1 mebibyte, i.e.
1024 * 1024 bytes (optionally referencing SI prefixes
   https://www.bipm.org/en/publications/si-brochure
   https://www.nist.gov/pml/weights-and-measures/metric-si-prefixes
and IEC binary power prefixes
   https://www.nist.gov/pml/special-publication-330/sp-330-section-3
   https://en.wikipedia.org/wiki/IEC_60027 ).

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