I thought this was only true for HFS? (not HFS+)
----- Original Message -----
From: "Irena Solomon" <[EMAIL PROTECTED]>
To: "retro-talk" <[EMAIL PROTECTED]>
Sent: Monday, August 14, 2000 11:10 AM
Subject: Re: a simple (admittedly newby) question


> Hello,
>
> This has to do with the difference between the logical size of a file (or
> how many bytes of data in contains) and it's physical size (or how much
> space it takes up on the disk on which it resides.)
>
> Every Macintosh volume only formats to 65,636 allocation blocks,
regardless
> of it's capacity.  For instance, a 128MB hard drive formats to 65,636 1kb
> blocks, whereas a 1G hard drive formats to 65,636 16kb blocks.  A file
that
> takes only 1kb on the 128MB drive, when transferred to the 1G drive, will
> appear as a 16kb file.  Files fill the full allocation block, even if
there
> is as little as a single byte of data in the block, since different files
> are not allowed to co-habit in the same blocks. For more information on
> black allocation size, see Tech Note 412 at:
>
> http://www.dantz.com/index.php3?SCREEN=technotes
>
> Regards,
>
> Irena
> Technical Support Specialist
> Dantz Development Corporation
> 925.253.3050
> [EMAIL PROTECTED]
>
> on 8/13/00 11:23 PM, Steve LaMantia at [EMAIL PROTECTED] wrote:
>
> > Hi folks.  I've recently been delighted to discover
> > Retrospect and also this mailing list, and I thought
> > I'd jump right in with a newby question.
> >
> > (BTW, my system is Windows 95, OSR2.)
> >
> > In making selectors, when using file size as a
> > selector criteria, you get a choice as to:
> >
> > - file size on disk
> > - file size used
> >
> > What's the difference between the terms
> > "on disk" and "used"?  I understand that files have
> > "slack space", so that depending on your file system's
> > cluster size even, say, a 3-byte file actually takes
> > up, say, 1024 bytes on your drive.  And I suspect
> > that's exactly the difference between the terms "on
> > disk" and "used".  It's just that I'm not sure which
> > would be which, is all.  In the example I gave, would the
> > "file size on disk" be 3 bytes and the "file size used"
> > be 1024 bytes, or is it the other way around?
> >
> > BTW, as a Retrospect newby, I do have a handful of
> > other probably really basic questions that have come
> > up while experimenting with the software in order to
> > learn it.  Is this an okay place to ask those?  Thanks.
> >
> > Steve LaMantia
> > Seattle, WA
> >
> >
> >
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>
>
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