Standby Timer; Status; Interface Capability For Power Modes; Initial Power Mode At Power On - IBM DTNA-22160 - Travelstar 2.1 GB Hard Drive Specifications

5. Wait 1.5 Sec to spindle motor is stopped
6. Perform post process

10.4.4 Standby timer

The standby timer provides a method for the device to automatically enter standby mode from either active
or idle mode following a host programmed period of inactivity. If the device is in the active or idle mode,
the device waits for the specified time period and if no command is received, the device automatically enters
the standby mode.
If the value of SECTOR C O U N T register on Idle command or Standby command is set to 00h, the device
will automatically set the standby timer to 109 minutes.

10.4.5 Status

In the active, idle and standby modes, the device shall have R D Y bit of the status register set. If BSY bit is
not set, the device shall be ready to accept any command.
In sleep mode, the device's interface is not active. A host shall not attempt to read the device's status or issue
commands to the device.

10.4.6 Interface Capability for Power Modes

The each power mode affects the physical interface as defined in the following table:
M o d e B S Y
A c t i v e
I d l e
S t a n d b y
S l e e p
Figure 39. Power conditions
Ready(RDY) is not a power condition. A device may post ready at the interface even though the media may
not be accessible.
Though the interface is inactive in sleep mode, the access to the interface registers and the validity of I N T R Q
is guaranteed for two seconds after Sleep command is completed. After this period, the contents of interface
registers may be lost. Since the contents of interface registers may be invalid, host should N O T check Status
register nor Alternate Status register prior to issuing soft reset to wake up a device.

10.4.7 Initial Power Mode at Power On

After power on or hard reset the device goes to IDLE mode or STNADBY mode depending on the option.
Refer 3.3.7.2, " Operating mode at power on" on page 14 for the intial power mode selection.
R D Y I n t e r f a c e a c t i v e
x x
o 1
o 1
x x
Y e s A c t i v e
Y e s A c t i v e
Y e s I n a c t i v e
N o I n a c t i v e
General Operation Descriptions
M e d i a
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