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Re: why does cloned mavericks drive use 5 gb less space than the original?

From Your Name <YourName@YourISP.com>
Newsgroups comp.sys.mac.system
Subject Re: why does cloned mavericks drive use 5 gb less space than the original?
Date 2015-03-23 09:13 +1200
Organization Aioe.org NNTP Server
Message-ID <230320150913098187%YourName@YourISP.com> (permalink)
References <2015032214264664806-anon@anonumostorg>

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In article <2015032214264664806-anon@anonumostorg>, Bill F
<anon@anonumost.org> wrote:
> 
> I make a bootable backup of my 120gb MBA SSD to a 120gb external drive 
> partition.  The SSD then reports 7gb free space and the external drive 
> reports 12gb free.  When I compare all folder sizes their total is 
> within 500mb of each other.  I can't understand why the clone has so 
> much more free space than the original.  All trashes are empty on both 
> drives.  

The block size for data can vary for different drives and formats. You
often saw this when copying files between floppy disks and hard drives.

Some drives may use (for example) a 4K block and others a 8K block. If
you save a 3K file onto the second drive it will need to take up a 8K
block, but saved onto the first drive it can fit in a 4K block. It
seems to take up less space on the first drive when you look at the KB
/ MB / GB size in the Get Info window, but if you look at the number of
*bytes* in the Get Info window they're exactly the same size.

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Thread

why does cloned mavericks drive use 5 gb less space than the original? Bill F <anon@anonumost.org> - 2015-03-22 14:26 -0400
  Re: why does cloned mavericks drive use 5 gb less space than the original? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2015-03-22 14:48 -0400
    Re: why does cloned mavericks drive use 5 gb less space than the original? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2015-03-23 18:29 +0000
  Re: why does cloned mavericks drive use 5 gb less space than the original? Your Name <YourName@YourISP.com> - 2015-03-23 09:13 +1200
    Re: why does cloned mavericks drive use 5 gb less space than the original? dempson@actrix.gen.nz (David Empson) - 2015-03-23 09:58 +1300
  Re: why does cloned mavericks drive use 5 gb less space than the original? dempson@actrix.gen.nz (David Empson) - 2015-03-23 09:27 +1300
  Re: why does cloned mavericks drive use 5 gb less space than the original? tmo1138 <tmo1138@tmo1138.com> - 2015-03-22 21:44 +0000
    Re: why does cloned mavericks drive use 5 gb less space than the original? billy@MIX.COM - 2015-03-22 22:30 +0000
  Re: why does cloned mavericks drive use 5 gb less space than the original? Jolly Roger <jollyroger@pobox.com> - 2015-03-22 23:49 +0000
    Re: why does cloned mavericks drive use 5 gb less space than the original? JF Mezei <jfmezei.spamnot@vaxination.ca> - 2015-03-22 20:35 -0400
      Re: why does cloned mavericks drive use 5 gb less space than the original? Jolly Roger <jollyroger@pobox.com> - 2015-03-23 01:21 +0000
      Re: why does cloned mavericks drive use 5 gb less space than the original? dempson@actrix.gen.nz (David Empson) - 2015-03-23 14:41 +1300
        Re: why does cloned mavericks drive use 5 gb less space than the original? nmassello@yahoo.com (Neill Massello) - 2015-03-22 20:23 -0600
      Re: why does cloned mavericks drive use 5 gb less space than the original? Lewis <g.kreme@gmail.com.dontsendmecopies> - 2015-03-23 18:30 +0000
  Re: why does cloned mavericks drive use 5 gb less space than the original? Bill F <anon@anonumost.org> - 2015-03-22 20:40 -0400
    Re: why does cloned mavericks drive use 5 gb less space than the original? dempson@actrix.gen.nz (David Empson) - 2015-03-23 14:41 +1300
      Re: why does cloned mavericks drive use 5 gb less space than the original? nmassello@yahoo.com (Neill Massello) - 2015-03-22 20:23 -0600
        Re: why does cloned mavericks drive use 5 gb less space than the original? Bill F <anon@anonumost.org> - 2015-03-26 03:00 -0400
          Re: why does cloned mavericks drive use 5 gb less space than the original? Electric Comet <electric-comet@mail.invalid> - 2015-03-27 20:56 -0700
            Re: why does cloned mavericks drive use 5 gb less space than the original? Jolly Roger <jollyroger@pobox.com> - 2015-03-28 21:07 +0000
  Re: why does cloned mavericks drive use 5 gb less space than the original? me@home.spamsucks.ca (Király) - 2015-03-23 02:34 +0000
  Re: why does cloned mavericks drive use 5 gb less space than the original? Electric Comet <electric-comet@mail.invalid> - 2015-03-23 16:18 -0700

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