What is the max size of SD card that can be used in a ViviCam 3785?

Card is too big. Specs in the manual say

SD memory card (optional) (up to 512MB capacity)

https://www.manualslib.com/manual/336674/Vivitar-Vivicam-3785.html?page=54#manual

..

All SD cards should work with the 5150s. However, SDHC cards will not. SD cards max out at 2GB in size.

This should do it - this comes from the manual Formatting will do what you want.

Formatting an SD Memory Card or Internal Memory This utility formats the internal memory (or memory card) and erases all stored images and data. 1. Press the button to turn on your ViviCam 3785. 2. Press the MODE button twice to enter [ ] Playback mode. Then press the button to enter the Playback menu. 3. Select [Delete] by using the / buttons, and press the button. 4. Select [Format ] by using the / buttons, and press the button. 5. If you want to format your SD memory card or the internal memory choose [OK] by pressing / buttons, then press the button to confirm.
To cancel the action, select [Cancel] instead.
[No Image] pops up after the SD memory card or internal memory has been formatted. Note:
Be sure the SD memory card is properly inserted into the camera before formatting it.
To format the internal memory, be sure to remove your SD memory card first.
Formatting will erase all information (even unrelated , non-camera data) from the memory/card.
For complete compatibility, be sure NOT to select FAT 32 as the file system when you format the SD card in your computer. Memory cards formatted in FAT 32 file system will not be recognized by this ViviCam 3785.

You need to use an SD or an SDHC card. They should be available at just about any department, electronics, or office-supply store.

You can format the SD card in your ViviCam 3785.

This utility formats the internal memory (or memory card) and erases all stored images and data. Make sure your SD card is in the unlocked position.
1. Press the button to turn on your ViviCam 3785.
2. Press the MODE button twice to enter Playback mode. Then press
the button to enter the Playback menu.
3. Select [Delete] by using the up/down arrow buttons, and press the OK button.
4. Select [Format ] by using the up/down arrow buttons, and press the OK button.
5. If you want to format your SD memory card or the internal memory choose
[OK] by pressing up/down arrow buttons, then press the OK button to confirm.

To cancel the action, select [Cancel] instead.

[No Image] pops up after the SD memory card or internal memory
has been formatted.

If you need a manual for your camera you can download a free PDF at
http://www.retrevo.com/support/Vivitar-3785-Digital-Cameras-manual/id/200ag818/t/2/
Please rate this solution. Thanks.

Manual says that camera only supports up to 512MB. Just tried it with a 2GB card now--gives a "Card Full" error.

You could place any size SD card in your camera. They go up to 8 Gigs.

most likely the memory you are using is either corrupted or not damaged, try using a diferent one similar to the SD card you are using...
cheers

I checked out the user manual and it looks like the SD memory card slot is located right next to the battery. Just open the battery compartment and look near the hinge and you will see a place to put an SD memory card. Here is a link to a pdf version of the manual which is nice to have even if you have the printed version:
Click HERE.

Take Care,
-WN

Try the manufactureres web site.
However if you computer is a Windoes machine[ME/2000/XP/Vista
No disc or sofrware is required.
Windows can do it all