we have an 8 gig mmc chip. looks just like an SD at first glance. http://www.jvcservice.com/store/ProductDetail.asp?part=QAM0467-002
http://en.wikipedia.org/wiki/MultiMediaCard wonder if one of these will work. seems it does sometimes. the price sure is right. At 01:09 PM 1/15/2008, you wrote: >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. 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