HDDs may result in higher power drain due to Adaptive D3 Idle Timeout keeping the disk in D0 for longer periods.
Sata ahci controller driver windows 10 windows#
Starting with Windows 10, drives with rotational media (HDDs or SSHDs) are supported on Modern Standby systems. This only occurs when the system is connected to AC power in order to preserve battery life and when the system is in Modern Standby in order to ensure disk activity is at a minimum.
Sata ahci controller driver windows 10 windows 10#
To specify a pattern to match multiple product IDs, use:.Path: HKLM\System\CurrentControlSet\Services\storahci\Parameters\Device.If you want to modify the minimum power cycle period, according to guidance from your device vendor, you can use the following registry key: This means that if such a drive is being power cycled more frequently than every 5 minutes it will instead remain powered up when idle for a short time to compensate. StorAHCI specifies a minimum power cycle period of 5 minutes for rotational drives.
If the power cycle frequency is low enough such that the device is not in danger of experiencing excess wear, then the D3 idle timeout value is shortened dramatically to ensure the drive is powered down quickly once it is idle in Modern Standby. If the actual power cycle frequency is trending too close to the worst case model, then the D3 idle timeout is increased to allow the trend to dip back into safer numbers. To help reduce wear and tear, Windows 10 includes Adaptive D3 Idle Timeout, where the device’s power cycle count is tracked and compared against a worst case model based on a typical device warranty (the worst case being where the drive would only last a couple of years). However, powering down a rotational drive too aggressively can result in excessive wear on the drive’s mechanical parts. The device needs to be powered down more aggressively when in Modern Standby in order to meet the system’s power requirements. Now that SATA drives with rotational media are supported on Modern Standby systems, there is a need to balance power savings with device reliability. As mentioned above, this implies that HIPM must be supported. Note that if the controller has specified that DEVSLP must be entered from Slumber, StorAHCI will first transition to Slumber and then upon completing the transition to Slumber it will immediately transition to DEVSLP. The following table shows the time the SATA device must be idle before it transitions to DEVSLP under different system power states. “Aggressive DEVSLP” per the SATA-I/O spec.).ĭEVSLP is mapped to a single logical idle power state or “F-State,” namely F1. Thus, StorAHCI does not use the hardware-controlled DEVSLP feature (a.k.a. StorAHCI controls DEVSLP directly in order to effectively balance power, responsiveness, and diagnosability. Thus, StorAHCI also needs to control transitions to Slumber. HIPM-only was chosen because StorAHCI controls DEVSLP transitions directly and typically DEVSLP-capable controllers indicate that DEVSLP can only be reached through the Slumber state. StorAHCI allows the controller to handle transitions from Active to Partial by enabling the “Aggressive Partial feature” of the SATA-I/O standard.Īfter the device enters D3, StorAHCI will immediately transition the link to Slumber. When the device is in D0, after the link has been in Partial for 100ms, StorAHCI will transition to Slumber. HIPM/DIPMīy default, HIPM-only is enabled and StorAHCI manages Partial to Slumber transitions.
This section details how Microsoft’s in-box SATA driver (StorAHCI) manages power and what configuration options are available.
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