Hitachi 100GB 7200 RPM HTE721010G9SA00 User Manual

Travelstar E7K100 (Serial ATA) Hard Disk Drive Specification

47 

ATA has the following three types of resets:

The actions of each reset are shown in the table below. 

O – execute

X – does not execute

Notes: 

The device executes a series of electrical circuitry diagnostics, spins up the 
head disk assembly, tests speed and other mechanical parametric, and sets 
default values.

COMRESET- is issued thought Out of Band (OOB) signal in Serial ATA bus.

The SRST bit in the Device Control Register is set and then is reset. The device 
resets the interface circuitry according to the Set Features requirement.

Aborting Host interface

-

O

O

Aborting Device operation

-

(*1)

(*1)

Initialization of hardware

O

X

X

Internal diagnostic

O

X

X

Spinning spindle

(*5)

X

X

Initialization of registers (*2)

0

O

O

Reverting programmed parameters to default   

Number of CHS (set by Initialize 

Device Parameters)   

Multiple mode

Write Cache   

Read look-ahead

ECC bytes   

O

(*6)

(*3)

Disable Standby timer

0

(*6)

x

Power mode

(*5)

(*4)

(*4)

(*1)

Execute after the data in write cache has been written.

(*2)

The default value on POR is shown in Table 29:  “Default Register Values” on page 48.

(*3)

The Set Features command with Feature register = CCh enables the device to revert these parameters to the 
power on defaults.

(*4)

In the case of Sleep mode, the device goes to Standby mode. In other cases, the device does not change current 
mode.

(*5)

Idle when Power-Up in Standby feature set is disabled.  Standby when Power-Up in Standby feature set is 
enabled.  

(*6)

See section Software Setting Preservation feature.