It has a barcode on it...
It is an electronic passport.
Western Digital Passport screen sizes vary. Screen sizes for the Western Digital Passport screen go from three inches to 6 inches. Larger screens are being made.
You do not apply for a WD passport. A WD Passport is an external USB hard drive that is made by Western Digital. It lets you save information and transport it to different computers.
The Western Digital My Passport features extremely low seek time and industry topping transfer rates. Western Digital is consdired one of the leaders in storage media. It is possible to find cheaper devices, but Western Digital is a highly recommended brand.
You can get a digital passport photo near you at various locations such as pharmacies, post offices, or photography studios that offer passport photo services. You can also check online for local businesses that provide this service.
One can purchase a My Passport hard drive directly from the official Western Digital website. Other retailers that also sell My Passport hard drives include Amazon, eBay, and Best Buy.
They can apply for one here www.mfa.gov.sg/phnompenh/Appnewpasspt.htm
The Western Digital Passport drives require a USB 2 port and are compatible with Macs running Mac OS X 10.4.11 or higher.
The My Passport Essential is powered entirely by USB 2.0; no external power source is required.
The My Passport Essential is connected to your computer using a USB 2.0 certifed cable.
it could tell who you are or if you a citizen
Without knowing the make and model no-one can tell you how to do it.