Xbian - SW Corruption issues

[Fred]

Can't explain exactly why changing the core_freq lowers chance of corruption. All I know is that for lots of SanDisk sd cards (like I have) it will not work with anything higher then 250. And it makes kind of sense to me that if you set it up to work faster, the chance of errors increases.

Change your cmdline.txt to this to disable the splash screen and show all messages to your attached tv/monitor. Now you can see what is going on instead of only knowing the booting takes a very long time. I guess it will be fsck that is fixing the corrupted root partition.

Code:

dwc_otg.fiq_fix_enable=1 sdhci-bcm2708.sync_after_dma=0 dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait

Also you can try a clean install and set both core_freq and arm_freq to defaults (250 and 700), to see if that helps.

But this is all fighting symptoms I guess. You said you have tried multiple sd cards but they are from the same kind/make? I would start with trying a different kind/make of sd card.
Search the web, there is a list of working sd cards on the RPi wiki. That list is however outdated and not tested for overclocking but it's the best I found (it also lists sandisks which I would not recommend based on my own experience).
I personally tried 3 different sd cards. First 2 did not work, third was a SanDisk that worked perfect for a while as long as you keep your core_freq at 250. Now my SanDisk sometimes doesn't boot anymore, but when it boots all is okay.

I ended up moving my root partition to an external usb disk so I could overlock, which also turned out to be faster.