RE: SD card media

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Karl,

Reading this about  SD's and sneaky recording media encryption I'm
wondering if there could be a similar problem built into DVD's?  I just
attempted to burn DVD backups of my pictures (not music or cine) from my
backup hardrive. When I try and access them they don't show a directory
and indicate they are full but with no data - huh?   With this kind of
trouble I'm probably going to just use cheap hard drives. 

AZ

Build a Lookaround!
The Lookaround Book, 4Th ed.
Now an E-book.
http://www.panoramacamera.us




> -------- Original Message --------
> Subject: SD card media
> From: karl shah-jenner <shahjen@xxxxxxxxxxxx>
> Date: Sun, February 19, 2006 7:26 am
> To: List for Photo/Imaging Educators - Professionals - Students
> <photoforum@xxxxxxxxxxxxxxxxxxxxxx>
> 
> 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


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