David Empson <dempson@[EMAIL PROTECTED]
> wrote:
> Interesting. I've noticed a similar problem with one of my card readers
> (an Olympus xD Memory Adapter, model MAUSB-200 - plug an xD card into
> the side of something resembling a USB flash drive "stick").
>
> What I observed was a horrible performance hit and/or errors when trying
> to copy some files off the 512 MB xD card, while others were OK. It
> seemed like it was only able to reliably access part of the memory on
> the card.
>
> My other "Silicon Power" multi-card reader works fine, and the Olympus
> one used to work, so I assumed that something had gone wrong with the
> Olympus one.
>
> The symptoms didn't make sense - the xD card's interface must use a
> serial protocol because there aren't enough pins to supply an address to
> it in parallel, and the successfully copied files were fine, so how
> could a hardware fault with the card reader have difficulty with some
> ****tion of the card's address space?
Now you mention it, xD cards are worse, although I've also had trouble
with a Sony Stick too. My CF cards from my Olympus E510 seem better
though.
> > The same cards can be connected and read perfectly when I use the
> > cameras directly.
> >
> > Oh, and the same card readers work fine in 10.4 on an old Sawtooth.
> >
> > Looking on the Apple forums reveals that I'm not alone, something was
> > broke in 10.5 at some point.
>
> Upon further reflection and thanks to your clue I realise that I would
> have used the Olympus previously under Tiger and that was probably the
> first time I used it under Leopard.
>
> A bug in Leopard's USB Mass Storage Device driver makes a lot more
> sense. I'll have to retest this card reader on my PowerMac G4 running
> Tiger for confirmation.
>
> I'll do some more tests.
It's a strange one, I've now plugged in an old Trust reader I have, and
had trouble with using in Tiger, and that seems to work fine in Leopard.
--
Andy Hewitt
<http://web.mac.com/andrewhewitt1/>
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