Archived posting to the Leica Users Group, 2010/09/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I highly suspect that upwards of 90% of SD card failures are due to physical damage - slight flexing of the circuit board inside the card causing the solder joins to break. On 21 September 2010 09:59, John Nebel <john.nebel at csdco.com> wrote: > Sonny, > > Another white paper, somewhat old: http://tinyurl.com/2aqmbh6. > > What you say is completely true, the cards are cheap enough for one to be > as conservative as he wants. It also true that trash do happen. > > Best, > > John > > > > On 9/20/2010 4:40 PM, Sonny Carter wrote: > >> On Mon, Sep 20, 2010 at 4:46 PM, John Nebel<john.nebel at csdco.com> >> wrote: >> >> Sonny, >>> >>> OK, I'll byte. >>> >>> >> >> That's fine, and I'll agree the theoretical life is amazing, and I don't >> doubt that the stuff will hold on to the information. Probably if you >> leave >> the sd card in situ in the camera, and pipe the info out through the usb, >> it >> will have near eternal life. >> >> But what happens in real life, for me at least, is that I shoot for a day, >> maybe 50-100 shots, (sometimes only ten shots for a Friday Flower) pull >> out >> the card, and stick it into a reader slot. I take down the pix, and stick >> the card back into my computer. >> >> Remember, for my M8, on an 8 gig card, I have in excess of 1000 pictures >> at >> full rez in raw. I might delete a few here and there, but I don't quit >> until I have the card at about 850, maybe 900 shots. >> >> Now, there's wear and tear on the contacts, the plastic case of the SD >> card >> is not exactly bulletproof, and I'm loading the card into two different >> computers and a camera. >> >> No white paper can convince me that trash don't happen in these real life >> circumstances. >> >> The cards are cheap enough that I retire them after I fill one. I don't >> reformat anymore. I once did, but I got burned twice. Once the card was >> corrupted, and the other time it fell in half. bad glue. That was two >> times too many. >> >> Thanks for the papers. They are interesting. Maybe the engineers need to >> also be photographers. >> >> >> >> >> >> >>> http://tinyurl.com/rf67m >>> >>> I think SD cards should be quite reliable, anecdotal evidence aside. >>> Maybe >>> one should expect an 80 year lifetime? >>> >>> I liked http://www.storagesearch.com/ssdmyths-endurance.html - the math >>> department run amok takes 50+ years to destroy a flash device? >>> >>> John >>> >>> PS >>> >>> I think about this every time I type "wr" in a Cisco switch or router and >>> write something out to the dreaded FLASH. >>> >>> On 9/19/2010 10:52 PM, Sonny Carter wrote: >>> >>> On Sun, Sep 19, 2010 at 11:37 PM, Daniel Tan<taniel.dan at gmail.com> >>>> wrote: >>>> >>>> I was under the impression that in some circles, it's standard practice >>>> >>>>> to >>>>> format your card each time you clear it (ie, download onto your >>>>> computer). >>>>> >>>>> >>>>> Well yes. but when you overwrite the media too many times, you run >>>> the >>>> risk of leaving digital debris. I personally would not reformat more >>>> than >>>> three times. >>>> >>>> I'll probably be proven wrong by someone who can cite technical stuff >>>> and >>>> have never had a problem because they are speaking theoretically. >>>> >>>> I only speak from experience. >>>> >>>> >>>> >>>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >>> >> >> >> > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > --