Barracuda ATA IV Family Product Manual, Rev. A 27

 

3.1.1  Supported ATA commands

The following table lists ATA-standard commands that the drive sup-

ports. For a detailed description of the ATA commands, refer to the Draft

ATA-5 Standard. See Section 3.1.4 on page 34 for details and subcom-

mands used in the S.M.A.R.T. implementation.

 

Command name Command code (in hex)

ATA-standard commands

Download Microcode

 92H

Exec ute Device Diagnostics

 90H

Flush Cache

 E7H

Format Track

 50H

Identify Device

 ECH

Initialize Device Parameters

 91H

Read Buffer

 E4H

Read DMA

 C8H, C9H

Read Multiple

 C4H

Read Sectors

 20H, 21H

Read Verify Sec tors

 40H, 41H

Recalibrate

 10H

Seek

 70H

Set Features

 EFH

Set Multiple Mode

 C6H

S.M.A.R.T.

 B0H

Write Buffer

 E8H

Write DMA

 CAH, CBH

Write Multiple

 C5H

Write Sectors

 30H, 31H

ATA-standard power-management commands

Check Power Mode

 98H or E5H

Idle

 97H or E3H

 

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Command name Command code (in hex)

Idle Immediate

 95H or E1H

Sleep

 99H or E6H

Standby

 96H or E2H

Standby Immediate

 94H or E0H

ATA-standard security commands

Security Set Password

 F1H

Security Unlock

 F2H

Security Erase Prepare

 F3H

Security Erase Unit

 F4H

Security Freeze Lock

 F5H

Security Disable Password

 F6H

3.1.2  Identify Device command

The Identify Device command (command code ECH) transfers informa-

tion about the drive to the host following power up. The data is organized

as a single 512-byte block of data, whose contents are shown in the table

on page 27. All reserved bits or words should be set to zero. Parameters

listed with an "x" are drive-specific or vary with the state of the drive. See

Section 1.0 on page 5 for default parameter settings.

The following commands contain drive-specific features that may not be

included in the Draft ATA-5 Standard.

 

Barracuda ATA IV Family Product Manual, Rev. A 29

 

 

Word Description Value

 Configuration information:

. Bit 15: 0 = ATA; 1 = ATAPI

 0C5AH

. Bit 7: removable media

0

. Bit 6: removable controller

. Bit 0: reserved

1 Number of logical cylinders 16,383

2 ATA-reserved

 0000H

3 Number of logical heads 16

4 Retired

 0000H

5 Retired

 0000H

6 Number of logical sectors per

 003FH

logical track: 63

7¨C9 Retired                                                   0000H

10¨C19 Serial number: (20 ASCII

charac ters, 0000H = none) ASCII

20 Retired

 0000H

21 Retired

 0400H

22 Obsolete

 0000H

23¨C26 Firmware revision (8 ASCII

 x.xx

charac ter string, padded with

blanks to end of string)

27¨C46 Drive model number: (40                                                   ST380021A

ST360021A

ASCII characters, padded

ST340016A

with blanks to end of string)

ST320011A

47 (Bits 7¨C0) Maximum sectors

 8010H

per interrupt on Read multi-

ple and Write multiple (16)

48 Reserved                                                  0000H

49 Standard Standby  timer,

 2F00H

IORDY supported and may

be disabled

50 ATA-reserved                                                  0000H

 

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Word Description Value

51 PIO data-transfer cycle

 0200H

timing mode

52 Retired                                                   0200H

53 Words 54¨C58, 64¨C70 and 88

 0007H

are valid

54 Number of current logical                                                    xxxxH

cylinders

55 Number of current logical                                                   xxxxH

heads

56 Number of current logical

sectors per logical track xxxxH

57¨C58 Current capacity in sectors xxxxH

59 Number of sectors trans-

 xxxxH

ferred during a Read Multiple

or Write Multiple command

 ST380021A =156,301,488

60¨C61 Total number of user-addres-

ST360021A = 117,231,408

sable LBA sectors available

ST340016A = 78,165,360

(see Section 2.2.3 for related

ST320011A = 39,102,336

information)

62 Retired

 0000H

63 Multiword DMA active and

 xx07H

modes supported (see note

following this table)

64 Advanced PIO modes sup-

 0003H

ported (modes 3 and 4 sup-

ported)

65 Minimum multiword DMA

 0078H

transfer cycle time per word

(120 nsec)

66 Recommended multiword

 0078H

DMA transfer cycle time per

word (120 nsec)

67 Minimum PIO cycle time

 00F0H

without IORDY flow control

(240 nsec)

 

Barracuda ATA IV Family Product Manual, Rev. A 31

 

 

Word Description Value

68 Minimum PIO cycle time with

 0078H

IORDY flow control (120

nsec)

69¨C74 ATA-reserved                                                    0000H

75 Queue depth                                                  0000H

76¨C79 ATA-reserved                                                    0000H

80 Major version number 003EH

81 Minor version number 0000H

82 Command sets supported 306BH

83 Command sets supported 4001H

84 Command sets support                                                   4000H

extension

85 Command sets enabled 30xxH

86 Command sets enabled 0001H

87 Command sets enable                                                   4000H

extension

88 Ultra DMA support and

 xx3FH

current mode

(see note following this table)

89 Security erase time

 0000H

90 Enhanced security erase

 0000H

time

91 Advanced power manage-                                                  0040H

ment value

92 Master password revision

 FFFEH

code

93 Hardware reset value

 xxxxH

(see description following

this table)

94 Auto acoustic management

 xxxxH

setting

95¨C127 ATA-reserved                                                     0000H

 

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Word Description Value

128 Security status                                                   0001H

129¨C159 Seagate-reserved                                                      xxxxH

160¨C254 ATA-reserved                                                      0000H

255 Integrity word                                                   xxA5H

Note. See the bit descriptions below for words 63, 88, 93 and 94 of

the Identify Drive data:

Description (if bit is set to 1)

Bit Word 63

0 Multiword DMA mode 0 is supported.

1 Multiword DMA mode 1 is supported.

2 Multiword DMA mode 2 is supported.

8 Multiword DMA mode 0 is currently active.

9 Multiword DMA mode 1 is currently active.

10 Multiword DMA mode 2 is currently active.

Bit Word 88

0 Ultra DMA mode 0 is supported.

1 Ultra DMA mode 1 is supported.

2 Ultra DMA mode 2 is supported.

3 Ultra DMA mode 3 is supported.

4 Ultra DMA mode 4 is supported.

8 Ultra DMA mode 0 is currently active.

9 Ultra DMA mode 1 is currently active.

10 Ultra DMA mode 2 is currently active.

11 Ultra DMA mode 3 is currently active.

12 Ultra DMA mode 4 is currently active.

13 Ultra DMA mode 5 is currently active.

 

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Bit Word 93

 

13 1=80-conductor cable detected, CBLID above VIH 

0=40-conductor cable detected, CBLID below VI L

Bit Word 94

0¨C7 Current AAM setting

8¨C15 AAM Power on default

3.1.3  Set Features command

This command controls the implementation of various features that the

driv e supports. When the drive receives this command, it sets BSY,

checks the contents of the Features register, clears BSY and generates

an interrupt. If the value in the register does not represent a feature that

the drive supports, the c ommand is aborted. Power-on default has the

read look-ahead and write caching features  enabled. The acceptable

values for the Features register are defined as follows:

 

02H Enable write cache (default).

03H Set transfer mode (based on value in Sector Count register).

Sector Count register values:

 

00H Set PIO mode to default (PIO mode 2).

01H Set PIO mode to default and disable IORDY

(PIO mode 2).

08H PIO mode 0

09H PIO mode 1

0AH PIO mode 2

0BH PIO mode 3

0CH PIO mode 4 (default)

20H Multiword DMA mode 0

21H Multiword DMA mode 1

22H Multiword DMA mode 2

40H Ultra DMA mode 0

41H Ultra DMA mode 1

42H Ultra DMA mode 2

 

34 Barracuda ATA IV Family Product Manual, Rev. A

 

 

43H Ultra DMA mode 3

44H Ultra DMA mode 4

45H Ultra DMA mode 5

05H Enable advanced power management

42H Auto acoustic management

FEH Performance seek

80H Quiet acoustic seek

55H Disable read look-ahead (read cache) feature.

82H Disable write cache.

AAH Enable read look-ahead (read cache) feature (default).

F1H Report full capacity available

Note. At power-on, or after a hardware or software reset, the default

values of the features are as indicated above.

3.1.4  S.M.A.R.T. commands

S.M.A.R.T. provides near-term failure prediction for disc drives. When

S.M.A.R.T. is enabled, the drive monitors predetermined drive attributes

that are susceptible to degradation over time. If self-monitoring determines

that a failure is likely, S.M.A.R.T. makes a status report available to the

host. Not all failures are predictable. S.M.A.R.T. predictability is limited to

the attributes the drive can monitor. For more information on S.M.A.R.T.

commands and implementation, see the Draft ATA-5 Standard.

SeaTools diagnostic software activates a built-in drive self-test (DST

S.M.A.R.T. command for D4H) that eliminates unnecessary drive returns.

The diagnostic software ships with all new drives and is also available at:

http://seatools.seagate.com.

This drive is shipped with S.M.A.R.T. features disabled. You must have

a recent BIOS or software package that supports S.M.A.R.T. to enable

this feature. The table below shows the S.M.A.R.T. command codes that

the drive uses.

 

Code in features                       S.M.A.R.T. command

register

D0H S.M.A.R.T. Read Data

D1H Vendor-spec ific