New for Storage Drivers

This topic summarizes the new features and improvements for storage in Windows 8.

Read Support for Crashdump Filter Drivers

Support is added in Windows 8 for a read callback routine in a crashdump filter driver. A read callback routine enables a filter driver to process the hiberfile on system resume. A read callback routine, Dump_Read, is now included in the FILTER_INITIALIZATION_DATA structure registered by crashdump filter drives during initialization.

Extended IEEE 1667 Support and Trusted Computing Group (TCG) Storage Silo for Enhanced Storage

Before Windows 8, the UsbStor.sys port driver contained the IEEE 1667 silo functionality. The IEEE 1667 silo functionality is moved from UsbStor.sys and into the new EhStorClass.sys driver. This move extends support of IEEE 1667 enabled devices to the other storage ports in addition to UsbStor.sys.

Also new in Windows 8 is the TCG Storage Silo driver, EhStorTcgDrv.sys. This silo driver implements the TCG protocol for band and key management for TCG-compliant storage devices.

The new suite of control codes for communication between silo drivers and the enhanced storage class driver are as follows:

Storport Enhancements

The enhancements to the Storport driver include many new features. The new features important to Storport miniport driver development are the following:

  • Extended SRB format

    Features specific to ATA Port, such as TRIM and SMART, prevented miniport development under the Storport model for devices that use them. Storport in Windows 8 accommodates these features with the addition of an extended SRB format. The STORAGE_REQUEST_BLOCK structure provides the extended SRB format. The Storport support routines that handle the SCSI_REQUEST_BLOCK structure now work with the STORAGE_REQUEST_BLOCK structure also.

  • ACPI Methods and Power Setting Notifications

    Miniport drivers can directly invoke ACPI methods for storage controllers with the StorPortInvokeAcpiMethod routine. Selected power setting notifications can be sent to a miniport driver by registering for notifications with the StorPortSetPowerSettingNotificationGuids routine.

Thin Provisioning

Allocation of uncommited storage provides flexible and efficient use of limited storage resources. Windows 8 provides information about the state of thinly provisioned storage. Thinly provisioned storage allocation status and information are available by using the following methods:

 

 

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