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Chapter 10
10-1 OVERVIEW
10-1-1 MASS STORAGE CLASS PROTOCOL
The MSC protocol is composed of three phases:
10
■
The Command Transport
■
The Data Transport
■
The Status Transport
Mass storage commands are sent by the host through a structure called the Command Block
Wrapper (CBW). For commands requiring a data transport stage, the host will attempt to
send or receive the exact number of bytes from the device as specified by the length and
flag fields of the CBW. After the data transport stage, the host attempts to receive a
Command Status Wrapper (CSW) from the device detailing the status of the command as
well as any data residue (if any). For commands that do not include a data transport stage,
the host attempts to receive the CSW directly after CBW is sent. The protocol is detailed in
Figure 10-1.
5HDG
&RPPDQG 7UDQVSRUW
 &%: 
166
'DWD 2XW  IURP +RVW 
6WDWXV 7UDQVSRUW
 &6: 
'DWD ,Q  WR +RVW 
Figure 10-1 MSC Protocol
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