persistence problem

[nu-by]

hello everybody!

just installed kali live on pen drive by using win32 disk imager
launched gparted and created new partition (ext4 & persistence)
then from terminal
mkdir /mnt/usb
mount /dev/sdb2 /mnt/usb
echo "/ union" >> /mnt/usb/persistence.conf
umount /mnt/usb
I boot my notebook from usb device, live boot + tab, I write persistence...
persistence doesn't work, I cant see it:(
I make all another time, I format the pen drive,
in computer I find:
computer hd
cd drive
tdk Lor TF10: persistence
fyle system
in tdk Lor TF10: persistence I find
lost+found folder
persistence.conf

I shut down, I reboot, select live, I push tab, I write persistence
I check in Computer:
persistence is disappeared
lost+found folder and persistence.conf are in the file system

I launch gparted, partition exist
/dev/sdb2 ext4 /lib/live/mount/persistence/sdb2

someone can help me to fix? Seems to me very strange that this happens only to me, so the problem is on my computer, my pen drive... my fingers.
Even if I'm not so skilled I'm absolutely sure that the procedure I follow is correct.
thank u sorry for my english

notebook compaq 6710b
kali-linux-1.0.5-i386
1)pendrive tdk L or TF10 16gb
2) pendrive sandisk 8gb

[nu-by]

Solved... please don't ask me how.
I've just formatted again the pen drive, download again kali-linux-1.0.5-i386, istalled again and hooop everything's working