Seagate ST800FM0022 Pulsar.2 SAS Product Manual - Page 54

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11.3.2

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 changeable.

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 com-

mand 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 values in volatile memory. It is not

possible to change the current values (or the saved values) with a MODE SELECT command before the drive 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 values 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 change-

able. For example, in Table 19, 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.

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 command pages for SCSI

implementation (see the

SAS Interface Manual

).

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

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

Section	Page
Pulsar®.2 SAS	1
Seagate Technology Support Services	7
1.0 Scope	8
2.0 Applicable standards and reference documentation	9
2.1 Standards	9
2.1.1 Electromagnetic compatibility	9
2.1.2 Electromagnetic compliance	10
2.1.3 European Union Restriction of Hazardous Substances (RoHS)	10
2.1.4 China Restriction of Hazardous Substances (RoHS) Directive	11
2.2 Reference documents	11
3.0 General description	12
3.1 Standard features	12
3.2 Media description	13
3.3 Performance	13
3.4 Reliability	13
3.5 Formatted capacities	13
3.6 Programmable drive capacity	14
3.7 Factory-installed options	14
3.8 Thin Provisioning	14
3.8.1 Logical Block Provisioning	14
3.8.2 Thin Provisioning capabilities	14
3.8.3 UNMAP	15
3.8.4 FORMAT UNIT command	15
3.8.5 Protection Information (PI) and Security (SED)	15
4.0 Performance characteristics	16
4.1 Internal drive characteristics	16
4.2 Performance characteristics	16
4.2.1 Access time	16
4.2.2 FORMAT UNIT command execution time for 512-byte LBA’s (minutes)	16
4.2.3 Performance	17
4.3 Start/stop time	18
4.4 Cache control	18
4.4.1 Caching write data	18
5.0 Reliability specifications	19
5.1 Error rates	19
5.1.1 Unrecoverable Errors	19
5.1.2 Interface errors	19
5.2 Endurance Management	20
5.2.1 Wear Leveling	20
5.2.2 Garbage Collection	20
5.2.3 Write Amplification	20
5.2.4 UNMAP	20
5.2.5 Data Retention	20
5.2.6 Lifetime Endurance Management (Available on select models)	20
5.2.7 SSD Percentage Used Endurance Indicator	20
5.3 Reliability and service	21
5.3.1 Annualized Failure Rate (AFR) and Mean Time Between Failure (MTBF)	21
5.3.2 Preventive maintenance	21
5.3.3 Hot plugging the drive	21
5.3.4 S.M.A.R.T.	21
5.3.5 Thermal monitor	22
5.3.6 Drive Self Test (DST)	23
5.3.7 Product warranty	24
6.0 Physical/electrical specifications	25
6.1 Power specifications	25
6.1.1 Power consumption	25
6.2 AC power requirements	25
6.3 DC power requirements	26
6.3.1 Conducted noise immunity	30
6.3.2 Power sequencing	30
6.3.3 Current profiles	30
6.4 Power dissipation	33
6.5 Environmental limits	34
6.5.1 Temperature	35
6.5.2 Relative humidity	35
6.5.3 Effective altitude (sea level)	35
6.5.4 Shock and vibration	36
6.5.5 Air cleanliness	37
6.5.6 Corrosive environment	37
6.5.7 Electromagnetic susceptibility	37
6.6 Mechanical specifications	38
7.0 About FIPS	40
8.0 About self-encrypting drives	41
8.1 Data encryption	41
8.2 Controlled access	41
8.2.1 Admin SP	41
8.2.2 Locking SP	41
8.2.3 Default password	41
8.3 Random number generator (RNG)	41
8.4 Drive locking	41
8.5 Data bands	42
8.6 Cryptographic erase	42
8.7 Authenticated firmware download	42
8.8 Power requirements	42
8.9 Supported commands	42
8.10 Sanitize - Cryptographic Erase	42
8.11 RevertSP	42
8.12 Sanitize Feature Set on SED Drives	42
9.0 Defect and error management	43
9.1 Drive internal defects/errors	43
9.2 Drive error recovery procedures	44
9.3 SAS system errors	44
9.4 Background Media Scan	44
9.5 Auto-Reallocation	44
9.6 Protection Information (PI)	45
9.6.1 Levels of PI	45
9.6.2 Setting and determining the current Type Level	45
9.6.3 Identifying a Protection Information drive	45
10.0 Installation	46
10.1 Drive orientation	46
10.2 Cooling	46
10.3 Drive mounting	47
10.4 Grounding	47
11.0 Interface requirements	48
11.1 SAS features	48
11.1.1 Task management functions	48
11.1.2 Task management responses	48
11.2 Dual port support	48
11.3 SCSI commands supported	49
11.3.1 INQUIRY data	53
11.3.2 MODE SENSE data	54
11.4 Miscellaneous operating features and conditions	59
11.4.1 SAS physical interface	59
11.4.2 Physical characteristics	62
11.4.3 Connector requirements	62
11.4.4 Electrical description	62
11.4.5 Pin descriptions	62
11.4.6 SAS transmitters and receivers	63
11.4.7 Power	63
11.5 Signal characteristics	63
11.5.1 Ready LED Out	63
11.5.2 Differential signals	64
11.6 SAS-2 Specification compliance	64

Seagate ST800FM0022 Pulsar.2 SAS Product Manual - Page 54

MODE SENSE data - hard drive

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