DISK DRIVE OPERATION
If the device is in the process of performing its off-line data collection activities and is interrupted by a
STANDBY IMMEDIATE command from the host, the device shall suspend or abort its off-line data
collection activities, and service the host within two seconds after receipt of the command. After receiving a
new command that causes the device to exit a power saving mode, the device shall initiate or resume off-line
data collection activities without any additional commands from the host unless the device aborted these
activities.
If the device is in the process of performing its off-line data collection activities and is interrupted by a
SMART DISABLE OPERATIONS command from the host, the device shall suspend or abort its off-line
data collection activities and service the host within two seconds after receipt of the command. Upon receipt
of the next SMART ENABLE OPERATIONS command the device may, after the next vendor specified
event, either re-initiate its off-line data collection activities or resume those activities from where they had
been previously suspended.
If the device is in the process of performing its off-line data collection activities and is interrupted by a
SMART EXECUTE OFF-LINE IMMEDIATE command from the host, the device shall abort its off-line
data collection activities and service the host within two seconds after receipt of the command. The device
shall then re-initiate its off-line data collection activities in response to the new EXECUTE OFF-LINE
IMMEDIATE command.
6.4.24.5 Smart read data (D0h)
This command returns the Device SMART data structure to the host.
Table 6-11 defines the 512 bytes that make up the device SMART data structure.
Table 6-11 Device SMART data structure
Byte F/V Descriptions
0-361 X Vendor specific
362 V Off-line data collection status
363 X Vendor specific
364-365 V Total time in seconds to complete off-line data collection activity
366 X Vendor specific
367 F Off-line data collection capability
368-369 F SMART capability
370-385 R Reserved
386-510 X Vendor specific
511 V Data structure checksum
Key:
F = the content of the byte is fixed and does not change.
V = the content of the byte is variable and may change depending on the state of the device or the
commands executed by the device.
X = the content of the byte is vendor specific and may be fixed or variable.
R = the content of the byte is reserved and shall be zero.
The value of the off-line data collection status byte defines the current status of the off-line activities of the
device. Table 6-12 lists the values and their respective definitions.