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From: billy@MIX.COM
Newsgroups: comp.sys.mac.system
Subject: Re: Block vs file level copy
Date: Sat, 8 Mar 2014 23:48:14 +0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
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Lewis <g.kreme@gmail.com.dontsendmecopies> writes:

> Disk Utility uses what block size?

$ diskutil info disk0s2
   Device Identifier:        disk0s2
   Device Node:              /dev/disk0s2

   Volume Name:              Macintosh HD

   File System Personality:  Journaled HFS+
   Type (Bundle):            hfs

   Partition Type:           Apple_HFS

   Total Size:               749.3 GB (749296615424 Bytes) (exactly 1463469952 512-Byte-Units)
   Volume Free Space:        538.8 GB (538799898624 Bytes) (exactly 1052343552 512-Byte-Units)
   Device Block Size:        512 Bytes

I'd hope block copies are done in at least 4096 byte chunks,
but I don't know how to check that...

Billy Y..
-- 
        sub     #'9+1   ,r0             ; convert ascii byte
	add     #9.+1   ,r0             ; to an integer
	bcc     20$                     ; not a number