Archived posting to the Leica Users Group, 2011/08/09
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 I would guess the camera is obsolete long before the card wears out.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