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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