multimedia card not working

[CharlesH]

I have a JVC camcorder (GR-D29OU) which has a memory card slot to take still pictures. Having 8 MB and 16 MB Multimedia Cards(CU-MMC8U and 16U) take 25 and 50 jpeg pictures - no problem, they can be copied off with my Sony cardreader.
To have a larger capacity I obtained a MMCPlus 4 GB Transcend card. To start it in the camcorder I had to Format it, than I took pictures. The first 13 pix were OK and transferable, but anything after them became garbled - could be seen on the LCD monitor - to transfer a message said:"Files are corrupted.". In many trials, always the first 13 pix are ok, the rest bad.
It might be that this subject is not for this forum, but someone might have a similar experience. Thank you for your interest.

[aedipuss]

mmc plus is not quite the same as old mmc cards. from wikipedia -

Version 4.x full-size cards and reduced-size cards can be marketed as MMCplus and MMCmobile respectively.
Version 4.x cards are fully backward compatible with existing readers but require updated hardware/software to use their new capabilities; even though the four-bit-wide bus and high-speed modes of operation are deliberately electrically compatible with SD, the initialization protocol is different, so firmware/software updates are required to support these features in an SD reader.

the camera may be too old to support their use.