ok, now i've successfully repartition-ed my t1, and every app and notes handwritings have been preserved.
mainly following the steps on the wiki and above mentioned links, and i reread
rupor's Step by step guide to repartition the device.
3. Worked for me. I dumped all the partitions and reboot several times, and I discovered from md5sums of img file I dumped that p1 p9 p10 changes from every reboot. p2 p5-8 stays the same.
4. uboot's old partition table is exactly like mine, but his new one is not strictly speaking a proper alignment, but it worked anyway.
I repartitioned t1, formatted p4 & p9, dd p10.img back to mmcblk2p10, copy back "data" from p9.img, and "READER" to p4.
The internal memory speed seemed slower than before, copying speed 800k-3MiB/s, or that's just the normal speed?
I haven't change the size of "system"(p10) partition, still 128MiB, is that enough? Will new apps install something into "system" partition? I mounted the p10.img and `df -h` give me "Size:100M Used:95M" 100m=128m??
If I installed something which is oversized (bigger than my Avail. space), will it broke the device? Should I make "system" partition bigger?