1.Read/write speed may vary depending on the different capacity and operating environment. 2.The usb drives default format is exFAT, and you can reformat it if needed. 3.1GB=1,000,000,000 bytes. The actual available capacity for data storage is less than the identifying capacity, as some of which is used for formatting and other functions. 4.Utilize the best transfer speed with USB 3.0 interface yet speed may vary based on host device, Interface type, file attributes and other factors. 5.When the USB flash drive enters water, need to wait for dry to avoid device short-circuit.