Crashes when using a 4to External HDD

[fab4real]

Hello, i'm using a PineA64+ with 2gb ram, with Android 5.1.

I tried to plug my Lacie 2d 4to External HDD (USB3 but support USB2).

i previously formatted it in Fat32 from DiskUtility on Mac.

But when i plug the external hdd, it's seen by the Pine a64 but after approximately 5 to 10 secondes, the mini computer crashes (automatically  reboot)

Did anyone succeed with pluging an external hdd, or a large external hdd ?

How can i find logs or something to resolve this issue ?

Any help appreciated ! 

Thanks