Ugh!!!
I just took a look at the SD card standards description on Wikipedia and
it's not pretty!
http://en.wikipedia.org/wiki/Secure_Digital_card
It explains my mystery of not finding a mainstream non SDHC 4GB card.
Apparently, mainstream vendors moved to SDHC when manufacturing that
size. A few fringe vendors apparently temporarily made a less compliant
4GB card. (not sure if it used 1.0 or 1.1 standard or neither.) and that
is apparently what my frail AData card was. (That also explains the
fact, which I hadn't mentioned, that the AData 4GB card wasn't readable
by my Palm TX while my Canon camera did.)
It seems that SD has 3 standards: 1, 1.1 and 2.0 (SDHC). DRM and SDIO
standards also complicate the issue.
Several things can be clearly understood from the Wikipedia article:
** All cards 1 GB and smaller are uncomplicated in their makeup and
across the board compatibility. (There should be no SD card/ SD device
compatibility problems)
** 2GB to 4GB cards can be of different standards. (There can be SD
card/ SD device compatibility issues)
** Some 4GB cards and all cards larger than 4GB are SDHC (SD 2.0) which
can only be used with newer SDHC compatible devices as they use a
completely different memory addressing scheme. (SDHC devices are
supposed to be backward compatible however ... they read 1.0 and 1.1
standard cards)
** SDIO is an additional SD format that supports embedded devices such
as GPS. The SD slot device must be SDIO complaint for an SD card with
such SDIO embedded tech to work no matter whether it is otherwise 1.0,
1.1 or 2.0.
It is also clear that Compact Flash standard and associated
compatibility issues ares less complex while the newer smaller XD and
other card protocols are even more complex than SD.
Not sure I doped out the Wikipedia correctly. Can anyone else add to
the above?
db
Rev. Stewart Marshall wrote:
There is a difference between SDHC and high speed.
high speed refers to the writing time for the card to read and write
there are differences between cards.
SDHC refers to the standard of capacity the card can hold with SDHC
being used for all cards (that meat the standard) 4GB and above.
Stewart
At 12:05 AM 1/15/2008, you wrote:
Actually my 256mb sd card is good enough for me when it comes
to just
doing pics. But Panasonic recommends the high speed card (I'm assuming
that is the sdhc?) for doing the quality video my camera is also
capable of doing. Though the video it's doing now seems fine. I
haven't tested it (timed it) but I guess I'm not going to get a very
long video with only 256mb. So, if the price is right I might as well
max it out to Panasonic specs if I can.
Jeff M
Rev. Stewart A. Marshall
mailto:[EMAIL PROTECTED]
Prince of Peace
Ozark, AL SL 82
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