Maxtor BlackArmor 320 GB USB 2.0 Portable External Hard Drive STM903203BAA1E1-RK Maxtor BlackArmor 320 GB Portable Hard Drive General Features: Black color 320 GB capacity USB 2.0 interface 5400 RPM spindle speed 8 MB cache buffer 480 Mbit/sec bus transfer rate 2.5-inch form factor Hardware-based full-disc encryption Password-based access KeyErase permanent removal Backup software Automated backup scheduling software included Blue LED indicator - PC PLATFORM SUPPORT ONLY - NOT COMPATIBLE WITH MAC OS X