Table
A-1.
Supported
SCSI-2
Commands
Command
Opcode
Use
Use
Description
(hex)
Before
When
Spinup
Wpl
Enabled
Change
40 No No
Requests
the
Target
to
change
to
the
specified
operating
Definition
definition.
Supported
definitions
are
SCSI (CCS)
and
SCSI-2.
Format
Unit
04
No No
Formats
Target
media
into
Initiator
addressable logic blocks.
Defect sources include P,
0,
and
G lists
(no
C
list).
When
formatting,
it
is recommended
that
the
Initiator
not
include a 0
list (FMTDAT=O). However,
if
the
Initiator
does
include a 0
list,
it
must
be
in
the
physical
sector
or
bytes
from
index
format.
The
Target
uses
an
interleave
of
1 regardless
of
the
value
in
Interleave field.
Inquiry
12
Yes
Yes
Requests
that
information regarding
Target
be
sent
to
the
Initiator.
Target
returns
36
bytes
of
SCSI
Standard
Product
Data.
Additional
Vital
Product
Data
(VPD)
may
be
supplied
if
requested
by
the
Initiator.
Mode Select
No 2
Yes
Provides a
means
for
Initiator
to
specify media, logical
unit,
or
(6-byte) 15
drive
parameters
to
Target.
The
following values
are
supported:
(to-byte)
55
•
Media
Type:
0
•
Density Code: 0
•
Number
of
Blocks:
used
to
set
capacity
of
drive
• Block Length: multiples
of
1, 2, 4, 8,
and
16
of
blocking
factor
•
Page
Codes (hex):
01,02,03,04,08,09,
OA
Use
of
the
following is
supported:
• Disable Correction
(OCR)
•
Data
Termination
on
Error
(DTE)
•
Post
Error
(PER)
•
Transfer Block
(TB)
•
Retry
Count
• Recovery Limit (converts
to
Retry
Count)
Mode Sense
No 2
Yes
Provides a
means
for
Target
to
report
its
media,
logical
unit,
or
(6-byte)
lA
drive
parameters
to
Initiator.
The
following
COB
values
are
(IO-byte)
5A
supported:
•
Page
Control
Field:
00
(current
values);
01
(changeable
vaIues)j
10
(default values);
11
(saved values)
•
Page
Codes (hex):
01,02,03, 04,08,09,
OA
The
Target
default block size is 512
bytes.
Default
page
parameters
are
listed
in
the
MODE
SENSE
command
description.
Read
No
Yes'
.
Requests
Target
to
transfer
data
to
Initiator.
Both
6-byte
and
(6-byte) 08 10-byte (extended)
command
formats
are
supported.
(to-byte)
28
Read
Buffer
3C
No
Yes
Used
with
WRITE
BUFFER
command
to
test
the
Target's
data
buffer. Recommend executing
RESERVE
command
to
guarantee
data
integrity.
Notes:
1.
WP
= Write
Protect
2. Mode Select
and
Mode
Sense commands
that
do
not
involve saved pages
may
be
used
before
spinup.
DRAFT
SCSI
Command
Descriptions
A-3
1/18/93 09:58
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