[X4U] Disk Erase failed

[alexandre]

> 
> 
>> but when i tried to format it with disk utility, i got an error:
> 
> The only kind of error I've gotten that's anything like that (don't remember the specific error) was when I tried to format using a scheme that was not compatible with the Partition Table. So I'd double-check how the drive was partitioned. Might not help, but couldn't hurt.
> 

thanks mike, but i double checked: i did select GUID…