In article <mailman.510.1365755188.3114.python-l...@python.org>,
 Cameron Simpson <c...@zip.com.au> wrote:

> 45046 is exactly 11 * 4096. I'd say your I/O is using 4KB blocks,
> and the last partial block (to make it up to 47970) didn't get
> written (at the OS level).

Yeah, this sounds like a good diagnosis.

BTW, the dtruss command I recommended in my earlier post would confirm 
this.  But, to be honest, it's such a likely scenario that it hardly 
needs confirmation.
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