Block vs file level copy

From	me@home.spamsucks.ca (Király)
Newsgroups	comp.sys.mac.system
Subject	Block vs file level copy
Date	2014-03-08 20:24 +0000
Organization	A noiseless patient Spider
Message-ID	<lffu94$shm$1@dont-email.me> (permalink)

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We had a discussion a while back about the speed of a block level vs a 
file level copy of one volume to another. It's generally considered 
that a block-level copy is faster, but some argued that a file-level 
copy will be faster if the volume contains a lot of free space. There 
was more disagreement about whether a block-level copy copies that free 
space or not.  I had the chance to test it over the last two days.

I had a 2TB volume that was only 25% full (of Time Machine backups.) I 
wanted to copy it to a 3TB volume.

Disk Utility's Restore function, which unmounts both the volumes and 
does a block-level copy, took 16 hours over FW800.

SuperDuper, which leaves the volumes mounted and does a file-level copy, 
took 5 hours.

That settled it for me.

-- 
K.

Lang may your lum reek.

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Block vs file level copy me@home.spamsucks.ca (Király) - 2014-03-08 20:24 +0000
  Re: Block vs file level copy Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-03-08 16:09 -0500
    Re: Block vs file level copy JF Mezei <jfmezei.spamnot@vaxination.ca> - 2014-03-08 16:33 -0500
      Re: Block vs file level copy Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-03-08 23:01 +0000
      Re: Block vs file level copy Oregonian Haruspex <bob_davis_retired@yahoo.com> - 2014-03-10 04:32 +0000
      Re: Block vs file level copy Siri Cruz <chine.bleu@yahoo.com> - 2014-03-09 22:34 -0800
    Re: Block vs file level copy Tom Stiller <clusterfux.upmon@gmail.com> - 2014-03-09 13:08 +0000
      Re: Block vs file level copy Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-03-09 11:41 -0400
  Re: Block vs file level copy Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-03-08 23:00 +0000
    Re: Block vs file level copy billy@MIX.COM - 2014-03-08 23:48 +0000
    Re: Block vs file level copy Martin Frost me at invalid stanford daht edu <nospam@stanford.edu.invalid> - 2014-03-08 22:14 -0700
      Re: Block vs file level copy Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-03-09 07:20 +0000
    Re: Block vs file level copy Siri Cruz <chine.bleu@yahoo.com> - 2014-03-09 22:55 -0800
  Re: Block vs file level copy Siri Cruz <chine.bleu@yahoo.com> - 2014-03-09 22:11 -0800

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