I suspect that there is something wrong with the NAND Flash of my C1000. So I installed OZ/GPE 3.5.4.1. In dmesg I saw these:

Empty flash at 0x0062bfa0 ends at 0x0062cf00
...

And A LOT OF similar messages. Does this mean my Flash is broken?!

I did the "NAND Flash (All)" test on the "Zaurus Test" Menu in DM and it were all OK, though.

no

Any further explaination? I've been having problems with the Flash on my C1000 (using pdaXrom and Cacko), everytime I reboot, there will be some new incorrect inode and bad checksum's in the JFFS2 root file system. There seems no way to "fix" them. Sometimes some file will corrupt and I have to reinstall the package, but after reboot, those same files are corrupted again. It seems the files are not really written to the Flash but only stay in the RAM. I think JFFS2 file system should be very stable so I thinking of hardware issues.

jffs2 is stable, cacko and pdaxrom are not.

jffs2 is relatively stable but its driver is a bit too chatty. just ignore the messages you see during bootup. they are just annoying but harmless. search the forum for mesages posted by iamasmith as he explains it a bit.

cacko is quite stable. pdaxrom and oz are not so stable. please don't knock the other distros, they aren't perfect but then oz is not so perfect either.

I kept trying to post a responce to this earlier but the site kept timing out... it I think it was "god" telling me to hold my breath... But I think you put it rather nicely

Late

Linus Torvalds said that to you???!!!

I don't know if this is an option but have you considered formatting the card? Have it search for bad blocks as it formats. If it's coming up clean and you're still seeing errors, then it could be the driver or the quality of the card. I've run into problems running 3.5.4.1 with the 2.6 kernel on my poodle where I run into a lot of I/O issues with GPE but none with Opie.