Hello thanks for your message. All the pics are taken with my ipad, except one or two which have been downloaded from Facebook. Each pic is between 600kb to 1.8Mb. Why do they vary so much in size?
JPEG is a lossy compression codec that can be set for different levels of quality (the lower the more information lost) - the lossy algorithms will eliminate information differently from each image taken based on its complexity, so depending on the latter & the quality level chosen, the final image size will be reduced and will vary between pics; e.g. just take a photo w/ the iPad of a solid colored piece of paper and look at its size.
I also have a few short videos which total around 20 minutes. Is this the problem? I can't work out how to check the size of the video files. Sorry for being so thick...
The iPad3 is capable of 1080p HD recording, thus like a HD DVD - although this will vary, a 2 hr HD movie is about 4 GB in size, so I suspect that your 20 mins or so in that video mode would be under 1 GB.
Is it possible that the data regarding storage use in my settings is erroneous?
Probably not as already stated, but worth doing a reset and then rechecking - directions below:
When an app (or several) are misbehaving, I usually go through the following steps:
1. Force Close - open the multi-tasking bar (double tap the 'home buttom' or use multi-gesturing and swipe up); press & hold an app until all begin to 'jiggle'; find the offending app(s) and press the 'red circle w/ minus sign' - return to the home screen & try again.
2. Restart - press & hold the 'Sleep/Awake' (a.k.a. power) button until a red slider appears (may take a few seconds) - move the slider to turn off the iPad; then press & hold the same button until the Apple logo appears - wait for a restart.
3. Reset - press & hold the 'Power' and 'Home' buttons simultaneously until the Apple logo appears - this may take a longer time, so have patience; the iPad will 're-boot' - NOTE that none of these maneuvers will alter your apps, files, or settings.
Good luck & please post back your results - Dave