Storage Media

First Aid USB Flash Drive

Through mac's teriminal to aid USB Flash Drive.

# check disk id of the USB Flash Drive
diskutil list

# unmount the disk
sudo diskutil umountDisk /dev/disk3

# Overwrite the disk with zero
sudo diskutil zeroDisk /dev/disk3

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