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

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] M9-SDHC Compatibility Issues
From: shino at panix.com (Rei Shinozuka)
Date: Tue, 09 Aug 2011 12:45:28 -0400
References: <036701cc5694$0005f240$0011d6c0$@earthlink.net> <4E4131F0.2060902@panix.com> <CAN1c0Bkpz97G_DZc3_sWQSKmfagcL_Rz9gKcXbLYkWTj5CLpoA@mail.gmail.com> <4C73D04F-021A-4FEF-9A14-D195CF26F9B5@aotera.org> <CA+=0raAgdRpUxU8W3Wx=MZy6xdv9TRC7VYomuFt3z3JHoROsTQ@mail.gmail.com>

Hey!  If those cards are linked to the sovereign rating of the US, they 
are AA+.  Or a more complete answer,  split-rated at Aaa/AA+/AAA.

-rei


On 08/09/2011 11:49 AM, mehrdad wrote:
> 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 I would guess the camera is obsolete long before the card wears out.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
>>
>
>



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)
Message from msadat at gmail.com (mehrdad) ([Leica] M9-SDHC Compatibility Issues)