Re-write GUID Partition Table (GPT) using NGFF to SSD Adapter
Here is the adapter I used to access my unbootable ChromeOS NGFF SSD:
As you can see, it adapts a NGFF SSD so that it fits into a standard Serial ATA interface port.
Pictured here is the adapter is on top of a Serial ATA 2.5" hard drive. Notice that the connector is identical.
I inserted my 128GB NGFF SSD into the Adapter:
Then, I inserted the Adapter into a USB to Serial ATA drive Adapter:
I connected this drive to my Ubuntu-Linux laptop and fired up GParted:
Next, from the GParted menu I chose Device/Create Partition Table:
From the drop-down box select "gpt".