Usb Data Transfer Protocol. And serial devices using a bus system hence the name usb. Data storage the data controller recognises that transport layer security will only provide appropriate protection whilst the data is in transit.

And serial devices using a bus system hence the name usb. That data is transfered in 4 different types of transfer. The sync field is 8 bits long at low and full speed or 32 bits long for high speed and is used to synchronise the clock of the receiver with that of the transmitter.
The following table shows the maximum transfer rates for each usb version.
Usb packets consist of the following fields sync all packets must start with a sync field. Types of usb data transfers all communication between a usb host and a usb device is addressed to a specific endpoint on the device. Usb protocol reset to ensure that the device usb signaling starts from a known state. Control transfers are used to carry information related to configuration of the peripheral device.