Currently Being ModeratedDec 6, 2012 4:38 PM (in response to vwpackrat)
Have the same issue with my "4". Well, about a month ago I noticed that I'm running out of space rapidly! Was really surprized to see 7,5 gb in "other memory". So what I did is made a copy with iTunes, restored the phone to 6.0.1 (the same day it was out). Before restoring the phone from backup copy one really interesting idea came to my mind. I decided to find a folder with backup on Mac HDD and check "heaviest" files in it. Surprisingly, I found 650 mb file in that folder (and lots of other "heavy" files)... then I added ".mov" extension to that file, and you know what?! I could play it with quick time. Everything sounds ok until now - the video file turned out to be the video I've deleted 6 months ago!!!! The video I made in april and deleted it from the phone was still on the phone in "other memory". I deleted it from the copy, then did the same thing with all next "biggest" files in the folder. Same thing!!! Almost every single file I opened with quicktime was the video that has been deleted a long time ago! Ok, I could find and clear about 3-4 gigs of trash from the folder, but!!! There're alwasy "but"s, after that I couldn't restore the phone from backup copy. 10-15 sec and you see error message. But still, contacts were restored from iCloud. I set my phone as a new phone and thought the issue is gone... now I have 2,3 gigs of "other". And noticed one thing - when you take a video/photo you can see that you have less memory since it's in "camera roll", but when you delete, for example 200mb video, you see no difference in memory usage. It remains just the same and seems like the file wasn't deleted from the phone. Actually you don't see it in photos, but it's still on the phone in "other memory".
Conclusion: that must be a bug since iOS 5.1 times! It lets you delete video/photo from camera roll, but what it actually does - just moves it to "other memory". Seems like "other memory" is sort of rubbish bin that can't be cleared up. Thats it.
Tutorials on youtube regarding "other memory" which teach you how to delete safari cache and "light weight" stuff all that is a wrong way in solving this issue. Must be something wrong with firmware or hardware. Think it's firmware.
P.S. DiskAid won't help. It can't "dive" deep into system folders.