Seagate Momentus XT / Laptop SSHD Momentus XT Product Manual - Page 35

Momentus XT Product Manual, Rev. B

29

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:

Note.

At power-on, or after a hardware or software reset, the default values of the features are as indi-

cated above.

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

46

H

Ultra DMA mode 6

55

H

Disable read look-ahead (read cache) feature.

82

H

Disable write cache

AA

H

Enable read look-ahead (read cache) feature

(default).

F1

H

Report full capacity available

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
2.2.1 LBA mode	11
2.2.2 Solid State Hybrid feature	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	16
2.9.3 Voltage tolerance	16
2.9.4 Power-management modes	17
2.10 Environmental specifications	18
2.10.1 Ambient temperature	18
2.10.2 Temperature gradient	18
2.10.3 Relative humidity	18
2.10.4 Wet bulb temperature	18
2.10.5 Altitude	18
2.10.6 Shock	19
2.10.6.1 Operating shock	19
2.10.6.2 Nonoperating shock	19
2.10.7 Vibration	19
2.10.7.1 Operating vibration	19
2.10.7.2 Nonoperating vibration	19
2.11 Acoustics	19
2.12 Electromagnetic immunity	20
2.13 Reliability	20
2.14 Agency certification	21
2.14.1 Safety certification	21
2.14.2 Electromagnetic compatibility	21
2.14.3 FCC verification	21
2.15 Environmental protection	23
2.15.1 European Union Restriction of Hazardous Substances (RoHS)	23
2.15.2 China Restriction of Hazardous Substances (RoHS) Directive	23
2.16 Corrosive environment	24
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	28
4.1 Hot-Plug compatibility	28
4.2 Serial ATA device plug connector pin definitions	29
4.3 Supported ATA commands	30
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
Index	39
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 Momentus XT / Laptop SSHD Momentus XT Product Manual - Page 35

Set Features command, Table 8, Set Features command values

Page 35 highlights