Seagate STBD1000100 Momentus 7200.2 SATA Product Manual - Page 36

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Momentus 7200.2 SATA Product Manual, Rev. E

4.3.2

Set Features command

This command controls the implementation of various features that the drive supports. When the drive receives

this command, it sets BSY, checks the contents of the Features register, clears BSY and generates an inter-

rupt. If the value in the register does not represent a feature that the drive supports, the command 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:

4

Ultra DMA mode 4 is supported.

8

Ultra DMA mode 0 is currently active.

9


10


11


12


13


Bit

Word 93

13

1 = 80-conductor cable detected, CBLID above V

IH

0 = 40-conductor cable detected, CBLID below V

IL

Table 8:

Set Features command values

02

H

Enable write cache

(default).

03

H

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

Sector Count register values:

00

H

Set PIO mode to default (PIO mode 2).

01

H

Set PIO mode to default and disable IORDY (PIO mode 2).

08

H

PIO mode 0

09

H

PIO mode 1

0A

H

PIO mode 2

0B

H

PIO mode 3

0C

H

PIO mode 4

(default)

20

H

Multiword DMA mode 0

21

H


22

H


40

H

Ultra DMA mode 0

41

H

Ultra DMA mode 1

42

H

Ultra DMA mode 2

43

H

Ultra DMA mode 3

44

H

Ultra DMA mode 4

45

H

Ultra DMA mode 5

41

H

Enable the Free Fall Protection feature (

default on ST9160823ASG and ST980813ASG models

)

(C1

H

below disables the Free Fall Protection feature)

55

H

Disable read look-ahead (read cache) feature.

82

H

Disable write cache

AA

H

Enable read look-ahead (read cache) feature

(default).

Section	Page
1.0 Introduction	7
1.1 About the Serial ATA (SATA) interface	8
2.0 Drive specifications	9
2.1 Specification summary table	9
2.2 Formatted capacity	11
2.2.1 LBA mode	11
2.3 Default logical geometry	11
2.4 Physical organization	12
2.5 Recording and interface technology	12
2.6 Physical characteristics	12
2.7 Seek time	13
2.8 Start/stop times	13
2.9 Power specifications	14
2.9.1 Power consumption	14
2.9.1.1 Typical current profile	15
2.9.2 Conducted noise	15
2.9.3 Voltage tolerance	15
2.9.4 Power-management modes	16
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
2.13.1 Free Fall Protection feature	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) Directive	22
2.15.2 China Restriction of Hazardous Substances (RoHS) Directive	22
2.16 Corrosive environment	22
3.0 Configuring and mounting the drive	25
3.1 Handling and static-discharge precautions	25
3.2 Configuring the drive	26
3.3 Serial ATA cables and connectors	26
3.4 Drive mounting	27
4.0 Serial ATA (SATA) interface	29
4.1 Hot-Plug compatibility	29
4.2 Serial ATA device plug connector pin definitions	29
4.3 Supported ATA commands	31
4.3.1 Identify Device command	33
4.3.2 Set Features command	36
4.3.3 S.M.A.R.T. commands	37
5.0 Seagate Technology support services	39
Index	41
A	41
B	41
C	41
D	41
E	41
F	41
G	41
H	42
I	42
K	42
L	42
M	42
N	42
O	42
P	42
Q	42
R	42
S	43
T	43
U	43
V	43

Seagate STBD1000100 Momentus 7200.2 SATA Product Manual - Page 36

Set Features command, Table 8, Set Features command values

Page 36 highlights