SanDisk CZ33 64GB Fit USB Flash Pen Drive Ultra Small with LED light 6

MB=1,000,000 bytes/ 1GB=1,000,000,000 bytes. Some of the capacity is used for formatting and other functions, and thus is not available for data storage.
As a result, your operating system may report as fewer megabytes (gigabytes)

*Speed will be different upon different device, software & usage.