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WMI Libraly > Win32_LogicalDisk Class

Win32_LogicalDisk Class

The Win32_LogicalDisk class represents a data source that resolves to an actual local storage device on a Win32 system.
The class returns both local as well as mapped logical disks. However, the recommended approach is to use this class for obtaining information on local disks and to use the Win32_MappedLogicalDisk class for information on mapped logical disk.
Namespace value is root/CIMV2.
WMI Provider value is CIMWin32.


  • Access
  • Access describes whether the media is readable (value=1), writeable (value=2), or both (value=3). "Unknown" (0) and "Write Once" (4) can also be defined.

  • Availability
  • The availability and status of the device. For example, the Availability property indicates that the device is running and has full power (value=3), or is in a warning (4), test (5), degraded (10) or power save state (values 13-15 and 17). Regarding the power saving states, these are defined as follows: Value 13 ("Power Save - Unknown") indicates that the device is known to be in a power save mode, but its exact status in this mode is unknown; 14 ("Power Save - Low Power Mode") indicates that the device is in a power save state but still functioning, and may exhibit degraded performance; 15 ("Power Save - Standby") describes that the device is not functioning but could be brought to full power 'quickly'; and value 17 ("Power Save - Warning") indicates that the device is in a warning state, though also in a power save mode.

  • BlockSize
  • Size in bytes of the blocks which form this StorageExtent. If variable block size, then the maximum block size in bytes should be specified. If the block size is unknown or if a block concept is not valid (for example, for Aggregate Extents, Memory or LogicalDisks), enter a 1.

  • Caption
  • The Caption property is a short textual description (one-line string) of the object.

  • Compressed
  • The Compressed property indicates whether the logical volume exists as a single compressed entity, such as a DoubleSpace volume. If file based compression is supported (such as on NTFS), this property will be FALSE.

  • ConfigManagerErrorCode
  • Indicates the Win32 Configuration Manager error code. The following values may be returned:
    0 This device is working properly.
    1 This device is not configured correctly.
    2 Windows cannot load the driver for this device.
    3 The driver for this device might be corrupted, or your system may be running low on memory or other resources.
    4 This device is not working properly. One of its drivers or your registry might be corrupted.
    5 The driver for this device needs a resource that Windows cannot manage.
    6 The boot configuration for this device conflicts with other devices.
    7 Cannot filter.
    8 The driver loader for the device is missing.
    9 This device is not working properly because the controlling firmware is reporting the resources for the device incorrectly.
    10 This device cannot start.
    11 This device failed.
    12 This device cannot find enough free resources that it can use.
    13 Windows cannot verify this device's resources.
    14 This device cannot work properly until you restart your computer.
    15 This device is not working properly because there is probably a re-enumeration problem.
    16 Windows cannot identify all the resources this device uses.
    17 This device is asking for an unknown resource type.
    18 Reinstall the drivers for this device.
    19 Your registry might be corrupted.
    20 Failure using the VxD loader.
    21 System failure: Try changing the driver for this device. If that does not work, see your hardware documentation. Windows is removing this device.
    22 This device is disabled.
    23 System failure: Try changing the driver for this device. If that doesn't work, see your hardware documentation.
    24 This device is not present, is not working properly, or does not have all its drivers installed.
    25 Windows is still setting up this device.
    26 Windows is still setting up this device.
    27 This device does not have valid log configuration.
    28 The drivers for this device are not installed.
    29 This device is disabled because the firmware of the device did not give it the required resources.
    30 This device is using an Interrupt Request (IRQ) resource that another device is using.
    31 This device is not working properly because Windows cannot load the drivers required for this device.

  • ConfigManagerUserConfig
  • Indicates whether the device is using a user-defined configuration.

  • CreationClassName
  • CreationClassName indicates the name of the class or the subclass used in the creation of an instance. When used with the other key properties of this class, this property allows all instances of this class and its subclasses to be uniquely identified.

  • Description
  • The Description property provides a textual description of the object.

  • DeviceID
  • The DeviceID property contains a string uniquely identifying the logical disk from other devices on the system.

  • DriveType
  • The DriveType property contains a numeric value corresponding to the type of disk drive this logical disk represents. Please refer to the Platform SDK documentation for additional values.
    Example: A CD-ROM drive would return 5.

  • ErrorCleared
  • ErrorCleared is a boolean property indicating that the error reported in LastErrorCode property is now cleared.

  • ErrorDescription
  • ErrorDescription is a free-form string supplying more information about the error recorded in LastErrorCode property, and information on any corrective actions that may be taken.

  • ErrorMethodology
  • ErrorMethodology is a free-form string describing the type of error detection and correction supported by this storage extent.

  • FileSystem
  • The FileSystem property indicates the file system on the logical disk.
    Example: NTFS

  • FreeSpace
  • The FreeSpace property indicates in bytes how much free space is available on the logical disk.

  • InstallDate
  • The InstallDate property is datetime value indicating when the object was installed. A lack of a value does not indicate that the object is not installed.

  • LastErrorCode
  • LastErrorCode captures the last error code reported by the logical device.

  • MaximumComponentLength
  • The MaximumComponentLength property contains the maximum length of a filename component supported by the Win32 drive. A filename component is that portion of a filename between backslashes. The value can be used to indicate that long names are supported by the specified file system. For example, for a FAT file system supporting long names, the function stores the value 255, rather than the previous 8.3 indicator. Long names can also be supported on systems that use the NTFS file system.
    Example: 255

  • MediaType
  • The MediaType property indicates the type of media currently present in the logical drive. This value will be one of the values of the MEDIA_TYPE enumeration defined in winioctl.h.
    Note: The value may not be exact for removable drives if currently there is no media in the drive.

  • Name
  • The Name property defines the label by which the object is known. When subclassed, the Name property can be overridden to be a Key property.

  • NumberOfBlocks
  • Total number of consecutive blocks, each block the size of the value contained in the BlockSize property, which form this storage extent. Total size of the storage extent can be calculated by multiplying the value of the BlockSize property by the value of this property. If the value of BlockSize is 1, this property is the total size of the storage extent.

  • PNPDeviceID
  • Indicates the Win32 Plug and Play device ID of the logical device. Example: *PNP030b

  • PowerManagementCapabilities
  • Indicates the specific power-related capabilities of the logical device. The array values, 0="Unknown", 1="Not Supported" and 2="Disabled" are self-explanatory. The value, 3="Enabled" indicates that the power management features are currently enabled but the exact feature set is unknown or the information is unavailable. "Power Saving Modes Entered Automatically" (4) describes that a device can change its power state based on usage or other criteria. "Power State Settable" (5) indicates that the SetPowerState method is supported. "Power Cycling Supported" (6) indicates that the SetPowerState method can be invoked with the PowerState input variable set to 5 ("Power Cycle"). "Timed Power On Supported" (7) indicates that the SetPowerState method can be invoked with the PowerState input variable set to 5 ("Power Cycle") and the Time parameter set to a specific date and time, or interval, for power-on.

  • PowerManagementSupported
  • Boolean indicating that the Device can be power managed - ie, put into a power save state. This boolean does not indicate that power management features are currently enabled, or if enabled, what features are supported. Refer to the PowerManagementCapabilities array for this information. If this boolean is false, the integer value 1, for the string, "Not Supported", should be the only entry in the PowerManagementCapabilities array.

  • ProviderName
  • The ProviderName property indicates the network path name to the logical device.

  • Purpose
  • A free form string describing the media and/or its use.

  • QuotasDisabled
  • The QuotasDisabled property indicates that Quota management is not enabled on this volume.

  • QuotasIncomplete
  • The QuotasIncomplete property indicates that Quota management was used but has been disabled. Incomplete refers to the information left in the file system after quota management has been disabled.

  • QuotasRebuilding
  • The QuotasRebuilding property indicates an active state signifying that the file system is in process of compiling information and setting the disk up for quota management.

  • Size
  • The Size property indicates in bytes, the size of the logical disk.

  • Status
  • The Status property is a string indicating the current status of the object. Various operational and non-operational statuses can be defined. Operational statuses are "OK", "Degraded" and "Pred Fail". "Pred Fail" indicates that an element may be functioning properly but predicting a failure in the near future. An example is a SMART-enabled hard drive. Non-operational statuses can also be specified. These are "Error", "Starting", "Stopping" and "Service". The latter, "Service", could apply during mirror-resilvering of a disk, reload of a user permissions list, or other administrative work. Not all such work is on-line, yet the managed element is neither "OK" nor in one of the other states.

  • StatusInfo
  • StatusInfo is a string indicating whether the logical device is in an enabled (value = 3), disabled (value = 4) or some other (1) or unknown (2) state. If this property does not apply to the logical device, the value, 5 ("Not Applicable"), should be used.

  • SupportsDiskQuotas
  • The SupportsDiskQuotas property indicates whether this volume supports disk Quotas

  • SupportsFileBasedCompression
  • The SupportsFileBasedCompression property indicates whether the logical disk partition supports file based compression, such as is the case with NTFS. This property is FALSE, when the Compressed property is TRUE.
    Values: TRUE or FALSE. If TRUE, the logical disk supports file based compression.

  • SystemCreationClassName
  • The scoping System's CreationClassName.

  • SystemName
  • The scoping System's Name.

  • VolumeDirty
  • The VolumeDirty property indicates whether the disk requires chkdsk to be run at next boot up time. The property is applicable to only those instances of logical disk that represent a physical disk in the machine. It is not applicable to mapped logical drives.

  • VolumeName
  • The VolumeName property indicates the volume name of the logical disk.
    Constraints: Maximum 32 characters

  • VolumeSerialNumber
  • The VolumeSerialNumber property indicates the volume serial number of the logical disk.
    Constraints: Maximum 11 characters
    Example: A8C3-D032


  • SetPowerState
  • SetPowerState defines the desired power state for a logical device and when a device should be put into that state. The desired power state is specified by setting the PowerState parameter to one of the following integer values: 1="Full Power", 2="Power Save - Low Power Mode", 3="Power Save - Standby", 4="Power Save - Other", 5="Power Cycle" or 6="Power Off". The Time parameter (for all state changes, except 5, "Power Cycle") indicates when the power state should be set, either as a regular date-time value or as an interval value (where the interval begins when the method invocation is received). When the PowerState parameter is equal to 5, "Power Cycle", the Time parameter indicates when the device should power on again. Power off is immediate. SetPowerState should return 0 if successful, 1 if the specified PowerState and Time request is not supported, and some other value if any other error occurred. In a subclass, the set of possible return codes could be specified, using a ValueMap qualifier on the method. The strings to which the ValueMap contents are 'translated' may also be specified in the subclass as a Values array qualifier.

  • Reset
  • Requests a reset of the logical device. The return value should be 0 if the request was successfully executed, 1 if the request is not supported and some other value if an error occurred.

  • Chkdsk
  • This method invokes the chkdsk operation on the disk. The method is applicable to only those instances of logical disk that represent a physical disk in the machine. It is not applicable to mapped logical drives. The return value of the method will indicate one of the following - Success - Chkdsk completed, Success - Locked and chkdsk scheduled on reboot, Failure - Unknown file system, Failure - Unknown error, Failure - Unsupported File System.

  • ScheduleAutoChk
  • This method is used schedule chkdsk to be run at the next reboot if the dirty bit has been set. The method is applicable to only those instances of logical disk that represent a physical disk in the machine. It is not applicable to mapped logical drives.

  • ExcludeFromAutochk
  • This method is used exclude disks from the chkdsk operation to be run at the next reboot. If not excluded, chkdsk is performed on the disk if the dirty bit has been set for the disk. Note that the calls to exclude disks are not cumulative. That is, if a call is made to excluded some disks, then the new list is not added to the list of ones that were already marked for exclusion, instead the new list of disks overwrites the previous one. The method is applicable to only those instances of logical disk that represent a physical disk in the machine and is not applicable to mapped logical drives.
    For example, a valid specification of drives would be "C:", "d:","G:" Note that the colon is required with the drive letter.

    Example WQL

    SELECT * FROM Win32_LogicalDisk
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