Seagate LD25 Product Manual - Page 16

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LD25 Series SATA Product Manual, Rev. C

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Standby mode

The drive enters Standby mode when the host sends a Standby Immediate command. If the host has set the

standby timer, the drive can also enter Standby mode automatically after the drive has been inactive for a

specifiable length of time. The standby timer delay is established using a Standby or Idle command. In Standby

mode, the drive buffer is enabled, the heads are parked and the spindle is at rest. The drive accepts all

commands and returns to Active mode any time disc access is necessary.

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Sleep mode

The drive enters Sleep mode after receiving a Sleep command from the host. In Sleep mode, the drive buffer

is disabled, the heads are parked and the spindle is at rest. The drive leaves Sleep mode after it receives a

Hard Reset or Soft Reset from the host. After receiving a reset, the drive exits Sleep mode and enters Standby

mode with all current translation parameters intact.

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Idle and Standby timers

Each time the drive performs an Active function (read, write or seek), the standby timer is reinitialized and

begins counting down from its specified delay times to zero. If the standby timer reaches zero before any

drive activity is required, the drive makes a transition to Standby mode. In both Idle and Standby mode, the

drive accepts all commands and returns to Active mode when disc access is necessary.

Section	Page
1.0 Introduction	7
1.1 About the Serial ATA interface	8
2.0 Drive specifications	9
2.1 Specification summary table	9
2.2 Formatted capacity	11
2.3 Default logical geometry	11
2.4 Physical organization	11
2.5 Recording and interface technology	11
2.6 Physical characteristics	12
2.7 Seek time	12
2.8 Time to ready	12
2.9 Power specifications	13
2.9.1 Power consumption	13
2.9.1.1 Typical current profile	14
2.9.2 Deferred spinup	14
2.9.3 Conducted noise	15
2.9.4 Voltage tolerance	15
2.9.5 Power-management modes	15
2.10 Environmental specifications	17
2.10.1 Ambient temperature	17
2.10.2 Temperature gradient	17
2.10.3 Humidity	17
2.10.3.1 Relative humidity	17
2.10.3.2 Wet bulb temperature	17
2.10.4 Altitude	17
2.10.5 Shock	18
2.10.5.1 Operating shock	18
2.10.5.2 Nonoperating shock	18
2.10.6 Vibration	18
2.10.6.1 Operating vibration	18
2.10.6.2 Nonoperating vibration	18
2.11 Acoustics	19
2.12 Electromagnetic immunity	19
2.13 Reliability	20
2.14 Agency certification	20
2.14.1 Safety certification	20
2.14.2 Electromagnetic compatibility	20
2.14.3 FCC verification	21
2.15 Environmental protection	22
2.15.1 European Union Restriction of Hazardous Substances (RoHS)	22
2.16 Corrosive environment	22
3.0 Configuring and mounting the drive	23
3.1 Handling and static-discharge precautions	23
3.2 Configuring the drive	24
3.3 Serial ATA cables and connectors	24
3.4 Drive mounting	25
4.0 Serial ATA (SATA) interface	27
4.1 Hot-Plug compatibility	27
4.2 Serial ATA device plug connector pin definitions	27
4.3 Supported ATA commands	29
4.3.1 Identify Device command	32
4.3.2 Set Features command	35
4.3.3 S.M.A.R.T. commands	36
5.0 Seagate Technology support services	37
A	39
B	39
C	39
D	39
E	39
F	39
G	39
H	40
I	40
K	40
L	40
M	40
N	40
O	40
P	40
Q	40
R	40
S	41
T	41
U	41
V	41

Seagate LD25 Product Manual - Page 16

Standby mode, Sleep mode, Idle and Standby timers - hard drive

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