CDU-541
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
The
data
to
be
transferred
is
preceded
by
a
four-byte
READ
BUFFER
header.
Table
5-11:
Read
Buffer
Header
==============================================================================
Bit:
7
6
5
4
3
2 1 o
Byte
:
==============================================================================
o : Reserved :
-----:-----------------------------------------------------------------------:
1 :
(MSB)
:
-----:---
---I
2 :
Available
Length :
----~:---
---I
3 : (LSB) :
==============================================================================
5.2.17.
READ
CAPACITY
Command
==============================================================================
Bit:
7
6
5
4
3
2
1 o
Byte
:
==============================================================================
o :
Operation
Code (25h) :
-----l-------------------------~---------------------------------------------:
1 :
Logical
Unit
Number:
Reserved
:
-----:-----------------------------------------------------------------------:
2 : Reserved :
-----:-----------------------------------------------------------------------:
3 : Reserved :
-----:-----------------------------------------------------------------------:
4 : Reserved :
-----:-----------------------------------------------------------------------:
5 : Reserved :
-----,-----------------------------------------------------------------------:
,
I
6 Reserved
-----------------------------------------------------------------------:
7
Reserved
I
I
-----------------------------------------------------------------------:
8
Reserved
I
I
-----------------------------------------------------------------------1
9
Control
Byte
I
I
=================================================================:============
The
READ
CAPACITY
command
a means
for
the
initiator
to
request
information
regarding
the
capacity
of
the
logical
unit.
The
eight
bytes
of
READ
CAPACITY
data
is
shown
below.
The
capacity
is
based
on
the
starting
address
of
the
lead-out
area
minus
one.
5-31
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