SiForce Lockbox Classic Encrypted Portable External Hard Drive Rugged (1TB SSD) The SiForce Lockbox Slim Utilizes 256-bit AES hardware military grade encryption for reliable operation of the portable external hard drive. The USB 3.0 interface provides uncompromising security and performance with super speed data transfers. Blue rugged shockproof sleeve is designed to protect the encrypted usb drive while in storage or during travel. Lockbox Classic is designed for easy plug and play connection. Formatted in NTFS, the native file system for Windows. The Lockbox Slim can also be reformatted for Mac compatibility. Steps for formatting can be found in the product manual included. The Lockbox Slim can also be reformatted for Mac compatibility. Steps for formatting can be found in the product manual included. Backup, store, edit, transfer or take your favorite videos, photos, music, documents and data with you wherever you go. The Lockbox Classic delivers transfer speeds of up to 5Gbps. This drive is a versatile travel companion.