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13.4.2
Set Features Data
The Get Features command provides a way for the drive to report its operating parameters to the host. The drive
maintains four sets of feature attributes:
1. Current values
Current values are volatile values being used by the drive to control its operation. A Set Features command can be
used to change the values identified as changeable values. Originally, current values are installed from saved or
default values after a reset.
2. Default values
Default values are hard-coded in the drive firmware stored in flash E-PROM (nonvolatile memory) on the drive's PCB.
These default values can be changed only by downloading a complete set of new firmware into the flash E-PROM. A
host can request and receive from the drive a list of default values and use those in a Set Features command to set up
new current and saved values, where the values are changeable.
3. Saved values
Saved values are stored on the drive media using a Set Features command. Only attribute values that are allowed to
be changed can be changed by this method. Attributes in the saved values list that are not changeable by the Set
Features command get their values from default values storage.
When power is applied to the drive, it takes saved values from the media and stores them as current values in volatile
memory. It is not possible to change the current values (or the saved values) with a Set Features command before the
drive is "ready." An attempt to do so results in a "Check Condition" status.
On drives requiring unique saved values, the required unique saved values are stored into the saved values storage
location on the media prior to shipping the drive. Some drives may have unique firmware with unique default values
also.
On standard OEM drives, the saved values are taken from the default values list and stored into the saved values
storage location on the media prior to shipping.
4. Supported Capabilities
Supported Capabilities returns the capabilities supported for this Feature Identifier. The capabilities supported are
returned in Dword 0 of the completion entry of the Get Features command.
13.5
Signal characteristics
This section describes the electrical signal characteristics of the drive's input and output signals. See
SFF-8639 connector pin descriptions
13.5.1
ACTIVITY# signal
The ACTIVITY# signal is driven by the drive as indicated in the table below.
Table 21 - ACTIVITY LED Out conditions
Drive stopped, not ready, and no activity
Drive stopped, not ready, and activity (command executing)
Seagate Nytro 5050 NVMe SSD Product Manual, Rev C
for signal type and signal name information.
Normal command activity
Table 16,
LED status
Off
Blinks (50ms on, 50ms off )
74
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