Wiping your phone and SD partition and starting from scratch doesn't solve the issue of almost 10gigs taken up and not knowing what it is. The stock rom itself surly isn't 10 gigs, we all know that for a fact. I just did a complete wipe of everything on my phone, and I'm still short 10 gigs. I paid for a 32 gig phone under the impression that I was getting 32 gigs of SD space for my personal use. Not 10 of it being used in some "other" category. HTC really dropped the ball on this. Just when you buy a phone with removable SD, advertised as 32 gigs, you GET that 32....well minus a gig or 2 for drivers for the card, but system files are stored on their own partition on the phone itself while you have full use of the SD card. When i go through file explorer, I see 2-3 different paths to get to the same point on my SD car which makes no dang sense to me. And I've been tempted to delete them but I'm afraid to do so. I've tried moving them and they end up coming back..obviously, after a reboot. There should be one path from the root of the system files to get to SD, not 3. On my phone, I've got SD, MMT, and storage, and all of them lead to the same end point, some with a few more stops along the way than others. HTC really dropped the ball when it comes to the user ability over storage management, and what they advertised vs what they provide in terms of storage capacity in this device. Would I return it? hell no. i love this phone despite this flaw. Would i go for it again knowing what I know now... honestly I'm unsure. I'd probably save up a little more and go for the 64 gig..be a little miffed over losing 10 gigs, but at least I'd know I still have plenty of space left as opposed to now. I take lots of pics of my family and i love music, so this is my MP3 Player as well. Not to mention any backups I do of the system and what not
Side note, I in fact asked this question when i first bought the phone when it made it's US debut, and got all sorts of off the wall answers.