Because the ID is read, it knows the size it should be, but sees no partition table, Windows just assumes that the drive must be new and blank. In the case of a WD My Passport or Elements drive that’s asking to be formatted, the system was able to read the device ID however was unable to read the partition table which is at the very beginning of the drive. Then after it has read the ID, it installs needed drivers (first time plugged in), and checks for a partition table. After Windows detects this chip, it then checks for the identification of the connected SATA device. Since these drives are native USB with no SATA interface they have a sort of bridge chip built onto the PCB that interfaces from the internal SATA traces to the USB port. When an external hard drive such as you My Passport or Elements drive is connected to your computer the system will first recognize the USB controller chip that’s built onto the hard drive. To answer that we must first consider some things about how Windows treats hard drives.
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