Information Technology Reference
In-Depth Information
3
The USB Mass Storage
Class
This chapter describes USB's mass storage class and presents device firmware
that demonstrates how mass-storage devices exchange data with USB hosts.
Requirements
In addition to complying with the USB 2.0 specification, a mass-storage
device must meet the requirements of the mass-storage class. The require-
ments include hardware capabilities and support for software protocols.
Specifications
The mass-storage class specification encompasses several documents. The
Specification Overview and Bulk-Only Transport documents are relevant to
almost all devices. The Bootability document applies to devices that systems
can boot from. Two additional documents, Control/Bulk/Interrupt (CBI)
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