Seagate ST3300457FC Cheetah 15K.6 SAS Product Manual - Page 62

58

Cheetah 15K.6 SAS Product Manual, Rev. B

9.3.2

Mode Sense data

The Mode Sense command provides a way for the drive to report its operating parameters to the initiator. The

drive maintains four sets of mode parameters:

1.

Default values

Default values are hard-coded in the drive firmware stored in flash E-PROM (nonvolatile memory) on the

drive’s PCB. These default values can be changed only by downloading a complete set of new firmware

into the flash E-PROM. An initiator can request and receive from the drive a list of default values and use

those in a Mode Select command to set up new current and saved values, where the values are change-

able.

2.

Saved values

Saved values are stored on the drive’s media using a Mode Select command. Only parameter values that

are allowed to be changed can be changed by this method. Parameters in the saved values list that are not

changeable by the Mode Select command get their values from default values storage.

When power is applied to the drive, it takes saved values from the media and stores them as current val-

ues in volatile memory. It is not possible to change the current values (or the saved values) with a Mode

Select command before the drive achieves operating speed and is “ready.” An attempt to do so results in a

“Check Condition” status.

On drives requiring unique saved values, the required unique saved values are stored into the saved val-

ues storage location on the media prior to shipping the drive. Some drives may have unique firmware with

unique default values also.

On standard OEM drives, the saved values are taken from the default values list and stored into the saved

values storage location on the media prior to shipping.

3.

Current values

Current values are volatile values being used by the drive to control its operation. A Mode Select command

can be used to change the values identified as changeable values. Originally, current values are installed

from saved or default values after a power on reset, hard reset, or Bus Device Reset message.

4.

Changeable values

Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values

and saved values can be changed by a Mode Select command. A one (1) indicates the value can be

changed. A zero (0) indicates the value is not changeable. For example, in Table 9.3.2.1, refer to Mode

page 81, in the row entitled “CHG.” These are hex numbers representing the changeable values for Mode

page 81. Note in columns 5 and 6 (bytes 04 and 05), there is 00h which indicates that in bytes 04 and 05

none of the bits are changeable. Note also that bytes 06, 07, 09, 10, and 11 are not changeable, because

those fields are all zeros. In byte 02, hex value FF equates to the binary pattern 11111111. If there is a zero

in any bit position in the field, it means that bit is not changeable. Since all of the bits in byte 02 are ones,

all of these bits are changeable.

The changeable values list can only be changed by downloading new firmware into the flash E-PROM.

Note.

Because there are often several different versions of drive control firmware in the total population of

drives in the field, the Mode Sense values given in the following tables may not exactly match those

of some drives.

The following tables list the values of the data bytes returned by the drive in response to the Mode Sense com-

mand pages for SCSI implementation (see the

SAS Interface Manual

).

Definitions:

DEF = Default value. Standard OEM drives are shipped configured this way.

CHG = Changeable bits; indicates if default value is changeable.

Section	Page
1.0 Scope	5
2.0 Standards, compliance and reference documents	7
2.1 Standards	7
2.1.1 Electromagnetic compatibility	7
2.1.1.1 Electromagnetic susceptibility	7
2.2 Compliance	8
2.2.1 Electromagnetic compliance	8
2.3 European Union Restriction of Hazardous Substances (RoHS)	8
2.4 Reference documents	9
3.0 General description	11
3.1 Standard features	12
3.2 Media description	12
3.3 Performance	12
3.4 Reliability	13
3.5 Formatted capacities	13
3.6 Programmable drive capacity	13
3.7 Factory-installed options	13
4.0 Performance characteristics	15
4.1 Internal drive characteristics	15
4.2 Seek time	15
4.2.1 Access time	15
4.2.2 Format command execution time (minutes)	16
4.2.3 General performance characteristics	16
4.3 Start/stop time	16
4.4 Prefetch/multi-segmented cache control	17
4.5 Cache operation	17
4.5.1 Caching write data	18
4.5.2 Prefetch operation	18
5.0 Reliability specifications	19
5.1 Error rates	19
5.1.1 Recoverable Errors	19
5.1.2 Unrecoverable Errors	19
5.1.3 Seek errors	20
5.1.4 Interface errors	20
5.2 Reliability and service	20
5.2.1 Annualized Failrue Rate (AFR) and Mean time between failure (MTBF)	20
5.2.2 Preventive maintenance	20
5.2.3 Hot plugging the drive	20
5.2.4 S.M.A.R.T.	21
5.2.5 Thermal monitor	22
5.2.6 Drive Self Test (DST)	23
5.2.6.1 DST failure definition	23
5.2.6.2 Implementation	23
5.2.6.2.1 State of the drive prior to testing	23
5.2.6.2.2 Invoking DST	24
5.2.6.2.3 Short and extended tests	24
5.2.6.2.4 Log page entries	24
5.2.6.2.5 Abort	25
5.2.7 Product warranty	25
6.0 Physical/electrical specifications	27
6.1 AC power requirements	27
6.2 DC power requirements	27
6.2.1 Conducted noise immunity	31
6.2.2 Power sequencing	31
6.2.3 Current profiles	31
6.3 Power dissipation	34
6.4 Environmental limits	40
6.4.1 Temperature	40
6.4.2 Relative humidity	41
6.4.3 Effective altitude (sea level)	41
6.4.4 Shock and vibration	41
6.4.4.1 Shock	41
6.4.4.2 Vibration	43
6.4.5 Acoustics	43
6.4.6 Air cleanliness	43
6.4.7 Corrosive environment	43
6.4.8 Electromagnetic susceptibility	44
6.5 Mechanical specifications	44
7.0 Defect and error management	47
7.1 Drive internal defects/errors	47
7.2 Drive error recovery procedures	47
7.3 SAS system errors	49
7.4 Background Media Scan	49
7.5 Media Pre-Scan	49
7.6 Deferred Auto-Reallocation	50
7.7 Idle Read After Write	50
8.0 Installation	51
8.1 Drive orientation	51
8.2 Cooling	51
8.3 Drive mounting	53
8.4 Grounding	53
9.0 Interface requirements	55
9.1 SAS features	55
9.1.1 task management functions	55
9.1.2 task management responses	55
9.2 Dual port support	56
9.3 SCSI commands supported	57
9.3.1 Inquiry data	61
9.3.2 Mode Sense data	62
9.3.2.1 ST3450856SS/ST3450056SS Mode Sense data	63
9.3.2.2 ST3300656SS/ST3300056SS Mode Sense data	64
9.3.2.3 ST3146356SS/ST3146756SS Mode Sense data	65
9.4 Miscellaneous operating features and conditions	66
9.4.1 SAS physical interface	66
9.4.2 Physical characteristics	69
9.4.3 Connector requirements	69
9.4.4 Electrical description	70
9.4.5 Pin descriptions	70
9.4.6 SAS transmitters and receivers	71
9.4.7 Power	71
9.5 Signal characteristics	71
9.5.1 Ready LED Out	71
9.5.2 Differential signals	72
9.5.2.1 Eye masks	72
9.5.2.1.1 Eye masks overview	72
9.5.2.1.2 Receive eye mask	73
9.5.2.1.3 Jitter tolerance masks	73
9.5.2.2 Transmitter signal characteristics	75
9.5.2.3 Receiver signal characteristics	76
9.5.2.3.1 Jitter	76
9.5.2.3.2 Receiver jitter tolerance	77
9.5.2.3.3 Compliant jitter test pattern (CJTPAT)	77
9.5.2.3.4 Impedance specifications	77
9.5.2.4 Electrical TxRx connections	78
9.5.2.4.1 Transmitter characteristics	78
9.5.2.5 Receiver characteristics	81
10.0 Seagate Technology support services	83
Numerics	85
A	85
B	85
C	85
D	85
E	85
F	86
G	86
H	86
I	86
J	86
L	86
M	86
N	86
O	87
P	87
Q	87
R	87
S	87
T	88
U	88
V	88
W	88

Seagate ST3300457FC Cheetah 15K.6 SAS Product Manual - Page 62

Mode Sense data, Note.

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