Since my N800 was out of battery in a very short time and after check that It happens when I was running maemo from the SD ext3 filesystem.

I decided to backup the files, format and restore them using a linux desktop and a SD reader.

I had a some errors uncompressing tar file, Steps I did:

(execution commands as root (sudo)
1. image backup of partition
dd -if .... -of ....img
2 tar -cf backup.tar /media/myN800
3 format ext3 partition with Qparteditor
4 uncompress tar file from desktop to SD ext3 partition
(after some hours I received errors in some files)

5 Try N800 without success

I think I can use the dd command to restore my backup image and return to the previous state, however, dd will place the content with the same initial fragmentation and I would like to avoid that file fragmentation.

What do you think about?
What about pipe the output of dd with the input of tar and create new tar file?
is ext3 a good filesystem for flash memory?