Re: Data transferred via USB ports is broken

From	lmarco@panix.com (Lou Marco)
Newsgroups	comp.sys.laptops
Subject	Re: Data transferred via USB ports is broken
Date	2011-05-17 16:56 +0000
Organization	Public Access Networks Corp.
Message-ID	<iqu9cl$p1p$1@reader1.panix.com> (permalink)
References	<91146369-341d-4b1a-95b1-c907d1ee178b@z7g2000prh.googlegroups.com>

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In article <91146369-341d-4b1a-95b1-c907d1ee178b@z7g2000prh.googlegroups.com>,
Stefan Mueller  <seekware@yahoo.com> wrote:
>
>Does someone have an idea what the problem could be and perhaps how it
>could be fixed?
>

	It's harmless in all but esoteric circumstances.  A device doesn't
really move a file character by character.  And if it does, the disc drive 
doesn't save data that way.  What's probably happening is that the chunks 
(blocks) that the USB device is using are larger or smaller than the blocks
something else in the data path is using.  When you have to fit 3 20 byte
blocks into 1 51 byte block (for example) you take the 51 byte block,
make it into 3 20 byte blocks, and then pad (fill) the empty space with 0 bytes
(or whatever).

	The operating system knows where the file really ends so the "padding"
doesn't matter.  The program that says they're different is probably just
adding up the size of the allocated blocks (the blocks that have some part of
the file).

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Thread

Data transferred via USB ports is broken Stefan Mueller <seekware@yahoo.com> - 2011-05-11 16:04 -0700
  Re: Data transferred via USB ports is broken Tom Cole <tacoleNOSPAM@yahoo.co.nz> - 2011-05-12 11:22 +1200
  Re: Data transferred via USB ports is broken Roger Mills <watt.tyler@gmail.com> - 2011-05-12 18:03 +0100
    Re: Data transferred via USB ports is broken "Anthony R. Gold" <not-for-mail@ahjg.co.uk> - 2011-05-13 23:23 -0400
      Re: Data transferred via USB ports is broken Roger Mills <watt.tyler@gmail.com> - 2011-05-14 20:57 +0100
        Re: Data transferred via USB ports is broken Stefan Mueller <seekware@yahoo.com> - 2011-05-14 15:41 -0700
          Re: Data transferred via USB ports is broken "Anthony R. Gold" <not-for-mail@ahjg.co.uk> - 2011-05-14 19:41 -0400
          Re: Data transferred via USB ports is broken "~misfit~" <sore_n_happy@nospamyahoo.com.au> - 2011-05-15 13:54 +1200
            Re: Data transferred via USB ports is broken "Anthony R. Gold" <not-for-mail@ahjg.co.uk> - 2011-05-14 22:47 -0400
              Re: Data transferred via USB ports is broken "Anthony R. Gold" <not-for-mail@ahjg.co.uk> - 2011-05-15 01:29 -0400
            Re: Data transferred via USB ports is broken Stefan Mueller <seekware@yahoo.com> - 2011-05-15 12:10 -0700
          Re: Data transferred via USB ports is broken lmarco@panix.com (Lou Marco) - 2011-05-17 17:01 +0000
            Re: Data transferred via USB ports is broken ak621@chebucto.ns.ca (Richard Bonner) - 2011-05-26 16:02 +0000
          Re: Data transferred via USB ports is broken ak621@chebucto.ns.ca (Richard Bonner) - 2011-05-26 15:57 +0000
  Re: Data transferred via USB ports is broken lmarco@panix.com (Lou Marco) - 2011-05-17 16:56 +0000

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