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WMI Libraly > Win32_Volume Class

Win32_Volume Class

The Win32_Volume class represents an area of storage on a hard disk. The class returns local volumes that are formatted, unformatted, mounted or offline. A volume is formatted by using a file system, such as FAT or NTFS, and may have a drive letter assigned to it. A single hard disk can have multiple volumes, and volumes can also span multiple disks. The Win32_Volume class does not support diskette drive management.
Namespace value is root/CIMV2.
WMI Provider value is MSVDS__PROVIDER.


  • 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.

  • Automount
  • If TRUE, the Automount property indicates that the volume will be mounted to the file system automatically when the first I/O is issued. Otherwise it will not be mounted until explicitly mounted with the Mount method or by adding a drive letter or mount point.

  • 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.

  • BootVolume
  • The BootVolume property indicates whether the volume contains the currently running operating system files.

  • Capacity
  • The Capacity property indicates in bytes, the size of the volume.

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

  • Compressed
  • If TRUE, the 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 volume on the system.

  • DirtyBitSet
  • Indicates if the ChkDsk method should be run at next boot up.

  • DriveLetter
  • The DriveLetter property indicates the drive letter assigned to the volume. This property is NULL for volumes without drive letters.

  • 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 volume.

  • IndexingEnabled
  • If context indexing is enabled this property will be TRUE

  • 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.

  • Label
  • The Label property indicates the volume name of the logical disk. Constraints: Maximum 32 characters. This property is NULL for a volume without a label.

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

  • MaximumFileNameLength
  • Maximum length of a filename component supported by the Windows 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

  • 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.

  • PageFilePresent
  • The PageFilePresent property indicates whether the volume contains a system memory paging file.

  • 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.

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

  • QuotasEnabled
  • The QuotasEnabled property indicates that quota management is enabled for 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 was disabled.

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

  • SerialNumber
  • The SerialNumber property indicates the serial number of the volume. Example: A8C3D032

  • 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 if the volume supports disk quotas.

  • SupportsFileBasedCompression
  • The SupportsFileBasedCompression property indicates if the volume supports file based compression as is the case with the NTFS file system.

  • SystemCreationClassName
  • The scoping System's CreationClassName.

  • SystemName
  • The scoping System's Name.

  • SystemVolume
  • The SystemVolume property indicates whether the volume contains the hardware specific files required to start the operating system.


  • 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 volume. The method is applicable to only those volume instances that represent a physical disk in the machine. It is not applicable to mapped logical drives.

  • 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 volume instances that represent a physical disk in the machine. It is not applicable to mapped logical drives.

  • ExcludeFromAutoChk
  • This method is used to exclude volumes from the chkdsk operation to be run at the next reboot. If not excluded, chkdsk is performed on the volume if the dirty bit has been set for the disk. Note that the calls to exclude volumes are not cumulative. That is, if a call is made to excluded some volumes, then the new list is not added to the list of ones that were already marked for exclusion, instead the new list of volumes overwrites the previous one. The method is applicable to only those volume instances that represent a physical disk in the machine and is not applicable to mapped logical drives.

  • Format
  • This method is used to format the volume.

  • Defrag
  • This method is used to defrag the volume.

  • DefragAnalysis
  • This method is used to generate a defrag analysis for the volume.

  • AddMountPoint
  • This method is used to add a mount point directory for the volume. The result of this method is the creation of a Win32_MountPoint class associating this volume with the Win32_Directory instance representing the directory specified in the parameter list

  • Mount
  • This method is used to mount a volume to the file system.

  • Dismount
  • This method is used to dismount a volume from the file system.

    Example WQL

    SELECT * FROM Win32_Volume
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