Using the current example (512-byte blocks):
18874368 bytes transferred in 113.823 secs (165821 bytes/sec)

Using bs=1m like we suggest in "Creating a bootable USB key using a
Un*x-like system":
18874368 bytes transferred in 2.894 secs (6521502 bytes/sec)

OK to change it?

Index: arm64/prep
===================================================================
RCS file: /cvs/src/distrib/notes/arm64/prep,v
retrieving revision 1.3
diff -u -p -r1.3 prep
--- arm64/prep  11 Feb 2017 07:07:10 -0000      1.3
+++ arm64/prep  27 Feb 2017 09:52:34 -0000
@@ -26,7 +26,7 @@ Booting from an SD card:
   
   Use the dd(1) utility to copy the miniroot to the hard drive.
   The command would likely be, under OpenBSD:
-       dd if=miniroot{:--:}OSrev.fs of=/dev/rsd1c
+       dd if=miniroot{:--:}OSrev.fs of=/dev/rsd1c bs=1m
   
   When you have connected the serial to you computer, a command such
   as "cu -l cuaU0 -s 115200" (assuming cuaU0 is your serial port device)
@@ -56,7 +56,7 @@ Install on systems without a supported m
   To do so first install the u-boot-aarch64 and dtb packages.  Write the
   provided miniroot image to an SD card:
 
-       dd if=miniroot{:--:}OSrev.fs of=/dev/rsdXc
+       dd if=miniroot{:--:}OSrev.fs of=/dev/rsdXc bs=1m
 
   Add a board specific DTB file:
 

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