This topic provides a brief overview about USB bulk transfers. In this topic, you'll learn about a USB bulk transfer and how to initiate a transfer request from your UWP app that communicates with a USB device.The Bulk In and Bulk Out endpoints are used to transport data between the host and the device. I have for a long time been wanting to do a Custom USB class driver on the RT106x devices. Each USB transfer is one packet, which can be up to 64 bytes if using bulk type. If you want to send more than 64 bytes, you have to use multiple packets. Step 1: Register for Secure Access Washington (SAW). Bulk Transfers are used for data which are not of the type Control, Interrupt, or Isochronous. We offer advanced U-matic to digital services for many of our clients, including tape incubation, repairs, time-based correction, and ProResHQ output. Use bulk filing to submit and amend reports, and pay taxes.