My Olympus xD Picture Card 128MB won't work with the HP photosmart 7760 -- the same brand 16MB card will work but when I put the 128MB in, I get an error message "CARD ACCESS ERROR." How shall I proceed?

If this is a C-700 camera the only memory card that can be used in that camera is a Smartmedia card from 16mb to 128mb. An xD card is not even supported by that camera at all.

The xD-Picture Card (xD stands for "extreme digital.") is a flash memory card format developed and introduced to the market in July 2002 by Olympus and Fujifilm, and manufactured by the Toshiba Corporation. xD cards are in Olympus and Fujifilm digital cameras, and are available in a range of sizes, from 16 MB to 2 GB currently. A higher-performance xD card known as Type M came out in 2005, and uses Multi Level Cell (MLC) architecture.
An xD card is 20mm x 25mm x 1.78mm and weighs about 2.8 g, making it significantly smaller than the nearly matchbook-sized CF card and about half the size of the SD/MMC card. As far as size goes, it is much closer to miniSD or RS-MMC. The manufacturer listed write speeds for xD-Picture Cards are: for the 16 MB and 32 MB card, 1.3 MB/s and for the 64MB and higher cards, 3 MB/s. Both offer a minimum read speed of 5 MB/s. The xD Type M cards have a faster standard rate of 4.0MB/s for reading and 2.5MB/s for writing.
Anything up to 2gb will work with your camera, either the type M or the type M+ will be fine.

Fuji uses 16MB xD card with the camera, which won't hold too many 4 Megapixel photos at the highest quality setting. So you should plan on buying a larger card right away. xD cards are currently available as large as 1GB, and I think 128MB is a good starter size for most people. Be warned that xD cards tend to be more expensive than CompactFlash and SD cards.

C-Series : Optical zoom lens cameras with sliding lens cover Product name xD-Picture Card *1-7 SmartMedia
3V(3.3V) CompactFlash Type M+ / M Type H Standard C-990ZS - - - X
2MB - 128MB - C-990 ZOOM - - - X
2MB - 128MB - C-960 ZOOM - - - X
2MB - 128MB - C-920 ZOOM - - - X
2MB - 128MB - C-900 ZOOM - - - X
2MB - 32MB - C-500 ZOOM X
256MB - 2GB X
256MB - 2GB X
16MB - 512MB - - C-480 ZOOM X
256MB - 2GB X
256MB - 2GB X
16MB - 512MB - - C-470 ZOOM X
256MB - 2GB X
256MB - 2GB X
16MB - 512MB - - C-460 ZOOM X
256MB - 1GB X
256MB - 2GB X
16MB - 512MB - - C-450 ZOOM X
256MB - 512MB X
256MB - 512MB X
16MB - 512MB - -
http://www.olympusimage.com.sg/pr/notice/1176786_707.html

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No one can expend efforts to diagnose, repair or let alone talk to you about what may be a 25 to 30 dollar memory card. I've had dozens of such failures but I deal with a fleet of devices and these are spread over the world now. The card, if the camera will not format it is tossed and you get a new one. Whatever you plugged it into is marked as suspect and I'd not do that again.

Yes, however the Olympus brand xD-Picture Card offers the ability to use the Panorama function.

Quality Mode Resolution 14MB Internal Memory 16MB xD-Picture Card 512MB xD-Picture Card SHQ 2288 x 1712 4 images 5 images 178 images HQ 2288 x 1712 14 images 16 images 523 images SQ1 1600 x 1200 27 images 32 images 1030 images SQ2 640 x 480 144 images 165 images 5324 images Storable movie length and resolution (approximate figures). The number of movies saved is based upon the storage capacity of the xD-Picture Card and length of each movie. Quality Mode Resolution 14MB Internal Memory 16MB xD-Picture Card 512MB xD-Picture Card HQ 320 x 240 30 fps movie 20 sec. max movie 24 sec. max movie 12 min. 54 sec. movie SQ 320 x 240 15 fps movie 41 sec. max movie 48 sec. max movie 25 min. 48 sec. movie

Quality Mode Pixel Resolution 16MB xD-Picture Card 512MB xD-Picture Card HQ 320 x 240 15 fps movie 15 sec. max per movie 480 sec. max per movie SQ 160 x 120 15 fps movie 60 sec. max per movie 1920 sec. max per movie

Quality Mode Pixel Resolution 16MB xD-Picture Card 512MB xD-Picture Card SHQ 2048 x 1536 6 shots 192 shots HQ 2048 x 1536 20 shots 640 shots SQ1 1024 x 768 76 shots 2432 shots SQ2 640 x 480 165 shots 5280 shots

The xD-Picture card is the memory card where the D-390 stores the pictures. xD-Picture Cards come in a variety of sizes currently ranging from 16MB through 256MB. Larger capacity xD cards allow you to store more pictures.