Excellent ----- Original Message ----- From: "karl shah-jenner" <shahjen@xxxxxxxxxxxx> To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@xxxxxxxxxxxxxxxxxxxxxx> Sent: Sunday, February 19, 2006 12:26 PM Subject: SD card media > thought this worth mentioning, for the potential pentax/nikon dslr owners > of the future who'll be faced with SD cards for their storage media > > > http://en.wikipedia.org/wiki/Secure_Digital > > "The "Secure" in Secure Digital comes from the card's origin. To create the > SD card, Toshiba added encryption hardware to the already-extant MMC card, > to calm music industry concerns that MMC cards would allow for easy piracy > of music. (" > > > So fouling those sectory and that's that, the card is dead. > > > > "The SD Card Association's current licensing agreement does not allow for > open-source SD drivers, a fact that generates a fair amount of > consternation in the open-source and free software communities. > The usual workaround is to develop an open-source wrapper for a closed- > source SD driver available on the particular platform, but this is far > from ideal. Another common workaround is to use the older MMC mode, > which all SD cards are required to support by the SD standard." > > suggesting it's not a *simple* card.. and anything not simple is prone to > failures. > > > "This means that SD is less open than CompactFlash or USB flash memory > drives," er, more 'not good' information > > > worse > > "Documentation for this mode can be purchased from the MMCA for $500; ..MMC > mode does not provide access to the proprietary encryption features of SD > cards, and the free SD documentation does not describe these features. " > > > basically if you addle the card, that's that. > > I'm suggesting that if anyone scrambles an SD card don't waste your time > trying to salvage it, just buy another > > I just spent 2 days running every data recovery and diagnostic tool over a > brand new card I scrambled - no luck, it was fried. The supplier replaced > it though so I was back in business again luckily.. how I forked it? > copying a large file onto it when doing something system intensive - it > hung the copying process and left crap on the card. Formatting it wiped > card -and the secure sectors and rendered it unable to be formatted again > :-( > > more: > > "The digital rights management scheme embedded in the SD cards is defined > as > the Content Protection for Recordable Media (CPRM) by the 4C Entity and is > centered around use of the Cryptomeria cipher (also known as C2). The > specification is kept secret and is only accessible to licensees. DVD-Audio > use a very similar scheme known as Content Protection for Prerecorded Media > (CPPM)." > > crap - DRM built right into the media :-( > > k > >
