STORAGE_DEVICE_DESCRIPTOR structure (ntddstor.h)
The STORAGE_DEVICE_DESCRIPTOR structure is used in conjunction with the IOCTL_STORAGE_QUERY_PROPERTY request to retrieve the storage device descriptor data for a device.
Syntax
typedef struct _STORAGE_DEVICE_DESCRIPTOR {
ULONG Version;
ULONG Size;
UCHAR DeviceType;
UCHAR DeviceTypeModifier;
BOOLEAN RemovableMedia;
BOOLEAN CommandQueueing;
ULONG VendorIdOffset;
ULONG ProductIdOffset;
ULONG ProductRevisionOffset;
ULONG SerialNumberOffset;
STORAGE_BUS_TYPE BusType;
ULONG RawPropertiesLength;
UCHAR RawDeviceProperties[1];
} STORAGE_DEVICE_DESCRIPTOR, *PSTORAGE_DEVICE_DESCRIPTOR;
Members
Version
Indicates the size of the STORAGE_DEVICE_DESCRIPTOR structure. The value of this member will change as members are added to the structure.
Size
Specifies the total size of the descriptor in bytes, including ID strings which are appended to the structure.
DeviceType
Specifies the device type as defined by the Small Computer Systems Interface (SCSI) specification.
DeviceTypeModifier
Specifies the device type modifier, if any, as defined by the SCSI specification. If no device type modifier exists, this member is zero.
RemovableMedia
Indicates when TRUE that the device's media (if any) is removable. If the device has no media, this member should be ignored. When FALSE the device's media is not removable.
CommandQueueing
Indicates when TRUE that the device supports multiple outstanding commands (SCSI tagged queuing or equivalent). When FALSE, the device does not support SCSI-tagged queuing or the equivalent. The STORPORT driver is responsible for synchronizing the commands.
VendorIdOffset
Specifies the byte offset from the beginning of the structure to a NULL-terminated ASCII string that contains the device's vendor ID. If the device has no vendor ID, this member is zero.
ProductIdOffset
Specifies the byte offset from the beginning of the structure to a NULL-terminated ASCII string that contains the device's product ID. If the device has no product ID, this member is zero.
ProductRevisionOffset
Specifies the byte offset from the beginning of the structure to a NULL-terminated ASCII string that contains the device's product revision string. If the device has no product revision string, this member is zero.
SerialNumberOffset
Specifies the byte offset from the beginning of the structure to a NULL-terminated ASCII string that contains the device's serial number. If the device has no serial number, this member is zero.
BusType
Specifies an enumerator value of type STORAGE_BUS_TYPE that indicates the type of bus to which the device is connected. This should be used to interpret the raw device properties at the end of this structure (if any).
RawPropertiesLength
Indicates the number of bytes of bus-specific data that have been appended to this descriptor.
RawDeviceProperties[1]
Contains an array of length one that serves as a place holder for the first byte of the bus specific property data.
Remarks
Applications and storage class drivers issue a device-control request with the I/O control code IOCTL_STORAGE_QUERY_PROPERTY to retrieve this structure, which contains information about a target device. The structure can be retrieved only from an FDO; attempting to retrieve device properties from an adapter causes an error.
An application or driver can determine the required buffer size by casting the retrieved STORAGE_DEVICE_DESCRIPTOR structure to a STORAGE_DESCRIPTOR_HEADER, which contains only Version and Size.
Requirements
| Requirement | Value |
|---|---|
| Header | ntddstor.h (include Ntddstor.h) |