IDE_DEVICE_PARAMETERS structure

The IDE_DEVICE_PARAMETERS structure contains configuration information that the port driver provides to the miniport driver to configure a device.

Syntax


typedef struct _IDE_DEVICE_PARAMETERS {
  USHORT                  Version;
  IDE_DEVICE_TYPE         IdeDeviceType;
  UCHAR                   TargetId;
  UCHAR                   MaximumLun;
  UCHAR                   NumberOfOverlappedRequests;
  UCHAR                   MaxBlockXfer;
  USHORT                  DeviceCharacteristics;
  ATA_ADDRESS_TRANSLATION AddressTranslation;
  union {
    LARGE_INTEGER MaxLba;
    struct {
      USHORT NumCylinders;
      USHORT NumHeads;
      USHORT NumSectorsPerTrack;
      USHORT Reserved;
    } Chs;
  };
  ULONG                   BytesPerLogicalSector;
  ULONG                   BytesPerPhysicalSector;
  ULONG                   BytesOffsetForSectorAlignment;
  ULONG                   TransferModeSupported;
  ULONG                   TransferModeSelected;
} IDE_DEVICE_PARAMETERS, *PIDE_DEVICE_PARAMETERS;

Members

Version

Indicates the size of the Device parameters structure. The miniport driver should verify that sizeof(IDE_DEVICE_PARAMETERS) is less than or equal to the Version field.

IdeDeviceType

Indicates the type of the device. The allowed device types are DeviceIsAta for ATA devices, DeviceIsAtapi for ATAPI devices, and DeviceNotExist if no device was found at that address. The other fields in this structure are not valid if the IdeDeviceType is set to DeviceNotExist.

TargetId

Specifies the target ID of the device.

MaximumLun

The miniport driver must update this field to indicate the maximum logical unit number supported by this device. By default, the member is set to 0 indicating the existence of just one LUN.

NumberOfOverlappedRequests

The miniport driver must update this field to specify the number of overlapped requests it can handle for this device. By default, the member is set to 1.

MaxBlockXfer

Specifies the number of sectors in a block of data to be transferred. This value applies to the data blocks used in ATA block transfer commands such as Read Multiple (0xC4), Write Multiple (0xC5). For more information about the ReadMultiple and WriteMultiple commands, see the ATA Specification.

DeviceCharacteristics

Specifies the device characteristics. The table below lists the characteristics that could be set in this member. The high byte of this member is opaque and shall not be changed by the ATA miniport.

Device CharacteristicDescription

DFLAGS_REMOVABLE_MEDIA

Indicates that the drive has removable media

DFLAGS_ REMOVABLE_DEVICE

Indicates that the device can be safely unplugged

DFLAGS_FUA_SUPPORT

Indicates that the device supports FUA (Force Unit Access)

DFLAGS_INT_DRQ

Indicates that the device interrupts as DRQ is set after receiving ATAPI Packet command

DFLAGS_MSN_SUPPORT

Indicates that the device supports Media Status Notification.

 

AddressTranslation

Contains an enumeration value of type ATA_ADDRESS_TRANSLATION that specifies the sort of address translation used during data transfers.

MaxLba

Specifies the maximum user-addressable logical block address (LBA). This member is defined when AddressTranslation is equal to either LbaMode or Lba48BitMode.

Chs

Specifies the drive geometry with the values for the number of cylinders, heads per cylinder, and the sectors per track. This member is defined when AddressTranslation is equal to ChsMode.

BytesPerLogicalSector

This member specifies the number of bytes per logical sector (LBA) for the given device.

BytesPerPhysicalSector

This member specifies the number of bytes per physical sector (that is, the smallest amount of data that the device can physically write internally) for the given device.

BytesOffsetForSectorAlignment

This member specifies the location of sector 0 within the first physical sector as defined in the ATA specification represented in bytes.

TransferModeSupported

Contains a bitmap that indicates the supported transfer modes.

TransferModeSelected

Indicates the selected transfer modes on the device. The miniport driver must set this member.

Remarks

The port driver passes a IDE_DEVICE_PARAMETERS structure to the miniport driver when it calls IdeHwInitialize.

Requirements

Header

Irb.h (include Irb.h)

See also

IDE_DEVICE_TYPE
ATA_ADDRESS_TRANSLATION
IdeHwInitialize

 

 

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