no external power supply is required, USB bus-powered
Product Capacity Available:
128MB = approximately 115MB-125MB 256MB= approximately 230MB-250MB 512MB = approximately 470MB-500MB 1GB = approximately 950MB-980MB 2GB = approximately 1.7G-1.9G 4GB = approximately 3.6GB-3.8GB 8GB = approximately 7.4GB-7.6GB 16GB = approximately 14GB -15GB 32GB = approximately 28GB -30GB 64GB = approximately 58GB -60GB