[HD2 Android Q&A, Help & Troubleshooting and Genera] Zippy1970:
*SIGH*

I'm just about to give up on Data2Ext. First of all, I thought I had figured out what was wrong. For some odd reason, whenever I tried to write to my 16GB microSD card on my computer using an SD adapter, it would crash every now and then. Also, partitioning through MiniTool Partition Wizard often resulted in a "Bad Disk" error. I tried this with 3 different 16GB microSD cards. All experienced the same problems when using an SD card adapter (it wasn't a broken SD adapter because I've tried several).

I then dug up an old external microSD USB card reader I had laying around. Using that, I was able to write to the microSD cards just fine and I didn't experience any problems partitioning either.

Speaking about partitioning, it took me a while to figure out that:

Partitioning through ClockWorkMod Recovery doesn't work properly. The FAT32 partition becomes incredibly slow, and the Ext partition is not recognized by Data2Ext

Ext3/Ext4 partitions don't work with Data2Ext. At least, not on my phone

Ext2 partitions only work if they are set as the primary partition

You must name the partition sd-ext or it will not work

Just a FYI for anyone finding this thread in the future.

Anyway, once I figured that out, I was finally able to get Data2Ext working. Sort of. Let me try to explain.

Previously after I had installed Data2Ext and setup some apps, a reboot of my phone would bring it back to a factory reset state. So all installed apps were gone, just like any settings I had altered. Oddly enough, if I looked at the sd-ext partition I could see the data was still there. It simply wasn't used by the phone. But after I had partitioned the sd-ext partition as Ext2, all was fine. A reboot didn't reset the phone back to factory settings.

So I happily reinstalled all my apps, restored my SMS as well as my WhatsApp backup and thought all was fine now. But I did notice the phone wasn't very stable. Every now and then it would become unresponsive for 10-20 seconds. Sometimes I got an error message that a certain app had become unresponsive and I was offered a choice to either shutdown the app or to wait. And sometimes, the phone would spontaneously reset itself.

Today the phone again became unresponsive. Oddly enough, long-pressing the power button did bring up the shutdown window. So I tapped "Shutdown". Next, the phone hung on "Shutting Down". It didn't come back to live. So I removed the battery lid and pressed the reset button.

After it had rebooted, I was greeted with a factory reset phone again. I was about to throw the phone through the window! But when I did another reboot, all my apps were back again as well as my settings. Except for the settings of my individual widgets. Those had all disappeared for some reason. Also, I got quite a few error messages that some apps had stopped unexpectedly. I rebooted again and again the phone behaved as if it were factory reset. But yet another reboot brought everything back...

I now suspect it has something to do with the phone not being able to mount sd-ext every now and then. Either way, my problems aren't solved yet so any tips are much appreciated.