Found something interesting.
Made the 3TB with mbr and partition 1 till 7 (i didn't make sda8) to flash uboot 4.
I can still access the folder "public"? (\\ipadress\public)
When i put a file there, uboot 4 for example, ssh into the drive, and use "ls /share/1000/public", it shows the uboot 4 file.
How can i use the folder when i didn't make sda8 and the folder?
when sda8 is not mounted the firmware will create in /share a folder with name 1000 and in that one a subfolder with name public.
So they are created in the system partition. Which is not too big (250 MB) so don't store big files there for the moment.
About the "freeze" you were talking about. When it is running the Linux kernel is in control and u-boot doesn't do anything, so I guess that the Lacie kernel/firmware caused the freeze. U-boot does only load the kernel in memory and gives control to it and only waits there for the next boot.
There is an eeprom present that influences the way it shutdown and powers up. That need to be reset properly at shutting down. If the Lacie firmware halted then you probably pulled the power plug and put in in again to reboot it. If this time is too short then it can happen what you describe, that it won't boot. Taking of power and pressing power button fa few times and wait a few minutes will restore the normal behavior.