First Aid USB Flash Drive
Through mac's teriminal to aid USB Flash Drive.
# check disk id of the USB Flash Drive
After overwriting the disk with zero, you can use it as a new a totally new USB Flash Drive.
The Difference Between GPT and MBR
MBR is earlier than GPT.
MBR: Main Boot Record. Maximum support is 2T.
GPT: GUID Partition Table. Support CRC to ensure the data complete and currect which is the not supported in MBR.
The comman combination usage:
Bios + MBR
UEFI + GPT