WD 2TB Blue My Passport Ultra Portable External Hard Drive - USB 3.0 - WDBBKD0020BBL-NESN [Old Model] Secure portable storage with 2 TB capacity. Formatted for Windows. For Mac compatibility this Hard Drive requires reformatting. Refer to Application Guide for guidance on this. Security : 256-bit AES hardware encryption. USB 3.0 connectivity; 3-year limited warranty. Stylish design with a range of exciting colors. Formatted for Windows. For Mac compatibility this Hard Drive requires reformatting. Refer to Application Guide for guidance on this