Archived posting to the Leica Users Group, 2011/08/09

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Subject: [Leica] M9-SDHC Compatibility Issues
From: msadat at gmail.com (mehrdad)
Date: Tue, 9 Aug 2011 08:49:11 -0700
References: <036701cc5694$0005f240$0011d6c0$@earthlink.net> <4E4131F0.2060902@panix.com> <CAN1c0Bkpz97G_DZc3_sWQSKmfagcL_Rz9gKcXbLYkWTj5CLpoA@mail.gmail.com> <4C73D04F-021A-4FEF-9A14-D195CF26F9B5@aotera.org>

are these cards AAA or AA-?

On Tue, Aug 9, 2011 at 8:41 AM, Spencer Cheng <spencer at aotera.org> wrote:

>
> On Aug 9, 2011, at 21:50, Forrest Herr wrote:
> >    The reason they are advising against formatting your older cards
> > is because Flash memory has a finite number of write cycles.  This
> > means that if you perform lots of write operations on your Flash
> > memory, eventually it will wear out, and you will experience data
> > loss.  The other side effect is that your camera might behave
> > strangely because it is trying to read or write to "bad" sectors on
> > the memory card, which can cause the camera to lock up.
> >
>
> The number of write cycle w/o wear levelling for modern's flash cards is
> 100K+ write cycles ie. you have to take at least 50K pictures * number of
> pictures that fits on the card before wear should become an issue. As very
> few photographers gets to that level of write cycles on any single SD card,
> I am not sure why Leica would offer this advice.
>
> > It sounds like users are experiencing problems with bad memory, or
> > heavily used memory cards.  So if you're shooting professionally it
> > would be prudent to cycle your older memory cards out of use after a
> > year or two.
>
> Possibly but that means the pro would have to fill that card about 50K
> times before it wears out. Assume 400 images per card, that is 20 million
> images has to be taken with that card. That's a lot of images on a single
> card. I would guess the camera is obsolete long before the card wears out.
>
> SD cards do go bad but for photographic purposes, wear doesn't seem to be
> an real problem.
>
> Regards,
> Spencer
>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>



-- 
  -------------------------------------
  regards, mehrdad


Replies: Reply from shino at panix.com (Rei Shinozuka) ([Leica] M9-SDHC Compatibility Issues)
In reply to: Message from red735i at earthlink.net (Frank Filippone) ([Leica] M9-SDHC Compatibility Issues)
Message from shino at panix.com (Rei Shinozuka) ([Leica] M9-SDHC Compatibility Issues)
Message from os.penguin at gmail.com (Forrest Herr) ([Leica] M9-SDHC Compatibility Issues)
Message from spencer at aotera.org (Spencer Cheng) ([Leica] M9-SDHC Compatibility Issues)