Digital BW, The Print

Tony--

Cardwiper is at:

http://www.photorescue.net/downloadcardwiper.htm

(photorescue.net instead of .com)

-matt


On Thu, Dec 27, 2012 at 4:02 AM, Tony Sleep <TonySleep@...>wrote:

> On 27/12/2012 00:48, Kip Babington wrote:
> > I've probably used a dozen different
> > cards over the years without incident - is this an indication that this
> > particular CF card is bad,
>
> Very likely the card is fine.  A card functions just like a disk, and has
> the same frailties - vulnerability to damage of the MBR, partition table
> or FAT. The most common cause of corruption is turning off the camera or
> battery failure whilst the card is still being written. Another common
> cause is use at very low temperatures - standard cards can become
> unreliable below 0C, Sandisk Extreme can manage much lower temps.
>
> It's also not unknown for the OS to get deranged and corrupt the
> filesystem. This occasionally happens because the camera mfr. firmware is
> slightly incompatible with some card mfr's implementation of the CF or
> SDHC standards. Canon at one time had a big problem with Lexar CF, and I
> think Nikon managed the same trick with Sandisk, but both were fixed by
> camera firmware updates.
>
> Another issue that needs to be mentioned is that the vast majority (95% at
> least!) of Sandisk cards sold on eBay (and Amazon marketplace) are Chinese
> counterfeit. They are very close in appearance and often include retail
> packaging, but are cheap low-spec memory, often slow, and without Extreme
> low temperature resilience.
>
> See http://martybugs.net/articles/fakesandisk.cgi for how to tell the
> difference.
>
> If you have one of those, return to the seller for refund or throw it away.
>
> If you have genuine Sandisk I'd suggest low-level formatting the card,
> which will pretty much return it to as-purchased condition. Photorescue
> used to make available a free utility called Cardwiper to do this, not
> sure whether they still do. Then format it in the camera and go and shoot
> test photos to fill the card. If there is no corruption, I'd regard the
> card as fine.
>
> Actual card failures are extremely rare with good brands, and will be
> covered by guarantee. I've never actually seen a failed card in 10 years
> of pro use, though I've seen a few temporarily deranged ones that could
> not be recovered via USB because the PC could not recognise the card as a
> disk due to MBR or partition table damage so wouldn't mount it. People
> generally throw them away at that point but I bought an IDE card reader to
> deal with those. IDE makes it possible to use low level DOS tools.
>
> If you can't find a copy of Cardwiper at photorescue.com (I couldn't last
> time I wanted to point someone to it) I don't think there is any
> illegality with me making it available at
> https://dl.dropbox.com/u/6401455/cw103.zip
>
> Be careful with Cardwiper, it will utterly wipe your card. That is all it
> does.
>
> --
> Regards
>
> Tony Sleep
> http://tonysleep.co.uk
>
>
> ------------------------------------
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-- 
Matt Haber Photography
Dance
Fashion
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