IDEREGS - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// ntdddisk.h

typedef struct _IDEREGS {
  UCHAR bFeaturesReg;
  UCHAR bSectorCountReg;
  UCHAR bSectorNumberReg;
  UCHAR bCylLowReg;
  UCHAR bCylHighReg;
  UCHAR bDriveHeadReg;
  UCHAR bCommandReg;
  UCHAR bReserved;
} IDEREGS, *PIDEREGS, *LPIDEREGS;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-ntdddisk-_ideregs)

_IDEREGS structure

Description

The IDEREGS structure is used to report the contents of the IDE controller registers.

Members

bFeaturesReg

Holds the contents of the Features register. This register is used to specify Self-Monitoring Analysis and Reporting Technology (SMART) commands. This member can hold any of the following values:

Feature Meaning
READ_ATTRIBUTES Retrieve the device attributes
READ_THRESHOLDS. Retrieve threshold values that indicate when a drive is about to fail.
ENABLE_DISABLE_AUTOSAVE. Enables the optional attribute autosave feature of the device when set to 1. Disables this feature when set to 0..
SAVE_ATTRIBUTE_VALUES. Instructs the device to save its attribute values to the device's non-volatile memory.
EXECUTE_OFFLINE_DIAGS Causes the device to begin collecting SMART data in off-line mode or execute a self-diagnostic test routine in either captive or off-line mode.
SMART_READ_LOG Retrieves the indicated log.
SMART_WRITE_LOG Writes the indicated number of 512-byte data sectors to the indicated log.
ENABLE_SMART Enables SMART functionality on the device.
DISABLE_SMART Disables SMART functionality on the device.
RETURN_SMART_STATUS Retrieves the reliability status of the device.
ENABLE_DISABLE_AUTO_OFFLINE Enables offline mode when set to 1. Disables offline mode when 0.

bSectorCountReg

Holds the contents of the sector count register. IDE sector count register.

bSectorNumberReg

Holds the contents of the sector number register.

bCylLowReg

Holds the contents of the IDE low-order cylinder register.

bCylHighReg

Holds the contents of the IDE high-order cylinder register.

bDriveHeadReg

Holds the contents of the IDE drive/head register.

bCommandReg

Holds the contents of the IDE command register.

bReserved

Reserved for future use. Should always be zero.

See also

ATA_PASS_THROUGH_DIRECT

ATA_PASS_THROUGH_EX

View the official Windows Driver Kit DDI reference

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