[AT&T Samsung Galaxy Note I717] Jamesyboy:
So,

Putting my infinite wisdom to use, I've established anecdotal evidence (oxymoron? I tease....) that says something is pooping on my MicroSD cards...and that something is....wait for it, wait for it....Custom ROMs (dun, dun, dunnnnnnn). Ehr Mah Guards!!!

I ran the stock ICS ROM for many, many months without issue, and my SD Card was a champ the whole time (excluding one time I plugged it into my Wintel Box, windows thought it was damaged and decided to move a few files around, leaving me a few hundred presents, in the form of LOST.DIR checkdisk files). However, once the Jellies Beans Leakz came out, it was quickly the consensus that it had become, literally overnight, the Bee's Knees. I hopped on mah 'pooter right 'way, and downloaded that sweet sweet ROM dew. Minutes later, and it was like Mardis Gras...if ya know what I mean. He he.

Fast furward about a month, and my Good Old Champ starting to fail on me. "SD Damaged. Yada yada yada...format me." So I did. I figured it was a one off thing kinda thing, ya know? So I continued on my happy way to flashing heaven...combining endlessly different mods, themes, etc. Since charging has always been slower on AOSP ROMs, I jus' charged me batterease in my external travel charger (which can charge a battery from zero to hero in 30 minutes flat), and when mah juices got down to critical levels, I just plopped may battery out, without shutting down or anything, and popped a new one back in! Ah...the marvels of modern devices, right? I figured I could shut this baby down a hundred different ways, and as along as I wasn't flashing something, I'd be fine!

WRONG!!! A week later, I was minding my own business, watching a Keira Knightley Flix, and I forgot to charge or change me battery. The thing crapped on me, and when i booted back up, KABLAM! YOUR SD CARD IS CORRUPTED!!! FORMAT ME NOWWWWWWW.

Oops! I went back to ICS, had a merry time for some months, and not furgetting about mah SD issue, I bought a new card. A stand up card, from a stand up kinda guy, I think his name was Mamason, and the SD card was made by Sand Tisk.

But im a regular kinda guy. So i spent a buttload of cheddar on it, thinking i suffered a fool for buyin' he cheap stuff before. Well no more! No more o' DAT cheap stuff for me Meow. You coodint pay me to use the cheap, regular, barnyard animal quality micros anymore!

So there I was, happy as a kitty with a catnip lollipop, on mah Galaxy Note, new Sandy Micros and e'rything, enjoyin me stocks. I enjoyed it for a few more months, unhindered....then I got fancy...I needed a fix. Bad.

So I decided to go checking out some new flashables, in the Developmental sections at the local ExDeeAysss. I got ter flashing...enjoyed meself quite a bit, dare I say--for about two weeks; before I got thàt DEEaarrrnnnn "SD damaged!" Message again. Yowserrs! Not again!

I formatted once more, switched to a different Bean ROM, and flashed away! Guess what? A month later: "SD Damaged!”

Emooooooo Raaaagggeeeee! Kaaaaammmaaayyyyyyuuuuuuhhhhh!

I went back to ICS, flashed and flashed some stuff there, and voila!!!! No issues!

Now, I cant tie this to random reboots, to Google's extremely vulgar and disappointing lack of knowledge when it comes to modern file systems, for supporting only FAT32, to code in the AOSP, or to a bug somewhere.....but what i can say, is that abusing my phone in AoSP almost immediately gets you a donkey punch to the Note face, leaving your SD Card's brain concussed, and your memory corrupted, with a complete loss of data. Which is really bad, if you plan on using your NANDROIDs on your external storage to recover from in case something bad happens.

I can also say that this doesn't seem to happen on the stock ROMs, or at least it doesn't happen nearly as often on Samsung ROMs. As someone who uses flash memory on an industrial scale for his side jobs and projects, and abuses it elsewhere, this isn't typical. ID really like to know if anyone else has any experience or knowledge to share here, which might just turn this from anecdotal evidence, to something a tad bit more concrete.

Anyone else care to share/chip in?