USB Simply Buffered (USB)
Mass Storage Class – Bulk-Only Transport
Copyright © 2007. Shakthi Kannan.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version
1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
Texts. A copy of the license is included in the section entitled “GNU Free Documentation License”.
Environment
● Debian Etch 4.0.
● x86 system.
● Sandisk Cruzer Mini 256 MB USB thumb drive.
The mass storage devices that comply with USB Mass Storage Class Specifications are supported by the USB Mass Storage Class Working
Group. The various specifications are:
● USB Mass Storage Class Control/Bulk/Interrupt (CBI) Transport
● USB Mass Storage Class Bulk-Only Transport
● USB Mass Storage Class UFI Command Specification
● USB Mass Storage Class Bootability Specification
● USB Mass Storage Class Compliance Test Specification
Most mass-storage devices follow the Bulk-Only Transport specification. This specification is available in usbmassbulk_10.pdf. Reading
“USB Simply Buffered – Device Enumeration” is a pre-requisite for this documentation.
There is a Command/Data/Status protocol that is followed:
● Command Block Wrapper (CBW)
● Data Transfer (IN/OUT)
● Command Status Wrapper (CSW)
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