Windows Driver Kit: Storage Devices
STORAGE_WRITE_CACHE_PROPERTY
The STORAGE_WRITE_CACHE_PROPERTY structure is used with the IOCTL_STORAGE_QUERY_PROPERTY request to retrieve information about a device's write cache property.
typedef struct _STORAGE_WRITE_CACHE_PROPERTY {
ULONG Version;
ULONG Size;
WRITE_CACHE_TYPE WriteCacheType;
WRITE_CACHE_ENABLE WriteCacheEnabled;
WRITE_CACHE_CHANGE WriteCacheChangeable;
WRITE_THROUGH WriteThroughSupported;
BOOLEAN FlushCacheSupported;
BOOLEAN UserDefinedPowerProtection;
BOOLEAN NVCacheEnabled;
} STORAGE_WRITE_CACHE_PROPERTY, *PSTORAGE_WRITE_CACHE_PROPERTY;
Members
- Version
- The version number of the write cache property.
- Size
- The size, in bytes, of the STORAGE_WRITE_CACHE_PROPERTY structure.
- WriteCacheType
- A WRITE_CACHE_TYPE-typed value that indicates the current write cache type
- WriteCacheEnabled
- A WRITE_CACHE_ENABLE-typed value that indicates whether the write cache is enabled.
- WriteCacheChangeable
- A WRITE_CACHE_CHANGE-typed value that indicates whether if the host can change the write cache characteristics.
- WriteThroughSupported
- A WRITE_THROUGH-typed value that indicates whether the device supports write-through caching.
- FlushCacheSupported
- A Boolean value that indicates whether the device allows host software to flush the device cache. If TRUE, the device allows host software to flush the device cache. If FALSE, host software cannot flush the device cache.
- UserDefinedPowerProtection
- A Boolean value that indicates whether a user can configure the device's power protection characteristics in the registry. If TRUE, a user can configure the device's power protection characteristics in the registry. If FALSE, the user cannot configure the device's power protection characteristics in the registry.
- NVCacheEnabled
- A Boolean value that indicates whether the device has a battery backup for the write cache. If TRUE, the device has a battery backup for the write cache. If FALSE, the device does not have a battery backup for the writer cache.
Comments
All of the parameter values that are described in this topic refer to the output of the IOCTL_STORAGE_QUERY_PROPERTY request.
Requirements
Headers: Declared in Ntddstor.h. Include Ntddstor.h.
See Also
IOCTL_STORAGE_QUERY_PROPERTY