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Date: Wed, 22 Jun 2016 02:12:01 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
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Message-ID: <304322535.20160622021201@yandex.ru>
To: Warren Young <wyml AT etr-usa DOT com>, cygwin AT cygwin DOT com
Subject: Re: Piping on 64-bit Cygwin, STC found
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Greetings, Warren Young!

> I used 64k and 64M (capitalization is important to dd),

You aren't confusing DD with some other tool?

$ dd if=/dev/urandom of=/dev/null bs=64K count=1
1+0 records in
1+0 records out
65536 bytes (66 kB, 64 KiB) copied, 0,0183668 s, 3,6 MB/s

$ dd if=/dev/urandom of=/dev/null bs=64k count=1
1+0 records in
1+0 records out
65536 bytes (66 kB, 64 KiB) copied, 0,00557431 s, 11,8 MB/s

$ dd if=/dev/urandom of=/dev/null bs=64kb count=1
dd: invalid number: ‘64kb’

$ dd if=/dev/urandom of=/dev/null bs=64kB count=1
1+0 records in
1+0 records out
64000 bytes (64 kB, 62 KiB) copied, 0,00562949 s, 11,4 MB/s

$ dd if=/dev/urandom of=/dev/null bs=64KB count=1
1+0 records in
1+0 records out
64000 bytes (64 kB, 62 KiB) copied, 0,00685924 s, 9,3 MB/s

$ dd --version
dd (coreutils) 8.25
Packaged by Cygwin (8.25-3)


-- 
With best regards,
Andrey Repin
Wednesday, June 22, 2016 02:08:29

Sorry for my terrible english...