The Integral AES 256-bit encryption range of USB Flash Drives for Apple Macs are fully compatible with Intel-based Mac computers or MacBook laptops running Apple Mac OS X and above.
However, the Integral AES 256-bit encryption range of USB Flash Drives does not support the older PowerPC processors/architecture, which were replaced by Apple in the beginning of 2006.
To identify which processor you have please follow the below support article from Apple:
http://support.apple.com/kb/ht1531