About capacity: 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 128GB = approximately 118.9GB -120.5GB