FbwfFileSystemInformation Class (Standard 8)

7/8/2014

Review the syntax, members, and examples of the FbwfSystemInforimation WMI provider class for Windows Embedded 8 Standard (Standard 8).

This class contains information about file system volumes.

The following syntax is simplified from Managed Object Format (MOF) code and includes all of the inherited properties.

Syntax

class FbwfFileSystemInformation
{
  sint64 AvailableAllocationUnits;
  uint32 BytesPerSector;
  string DriveLetter;
  uint32 SectorsPerAllocationUnit;
  uint32 SizeDisplayMode;
  sint64 TotalAllocationUnits;
  string VolumeName;
};

Members

This class defines the following types of members:

• Properties

Properties

This class defines the following properties.

Property	Data type	Qualifiers	Description
AvailableAllocationUnits	sint64	[Read]	Returns the total number of free allocation units on the volume that are available to the user associated with the calling thread.
BytesPerSector	uint32	[Read]	Returns the number of bytes in each sector.
DriveLetter	string	[Read]	Returns the drive letter of a file system volume.
SectorsPerAllocationUnit	uint32	[Read]	Returns the number of sectors in each allocation unit.
SizeDisplayMode	uint32	[Read, Key]	Returns the current size display mode. The following table shows the possible values. ValueDescription 0Actual disk size mode 1Virtual disk size mode
TotalAllocationUnits	sint64	[Read]	Returns the total number of allocation units on the volume that are available to the user associated with the calling thread.
VolumeName	string	[Read, Key]	Returns the name of a file system volume.

Remarks

When querying for property values with a uint64 or sint64 data type in a scripting language such as VBScript, WMI returns string values. Unexpected results can occur when comparing these values, because comparing strings returns different results than comparing numbers. For example, "10000000000" is less than "9" when comparing strings, and 9 is less than 10000000000 when comparing numbers. To avoid confusion you should use the CDbl method in VBScript when properties of type uint64 or sint64 are retrieved from WMI.

Requirements

Architecture	x64, x86
MOF	FBWFProvider.mof
Supported Clients	Windows XP Embedded SP3 Windows Embedded Standard 2009 Windows Embedded Standard 7 SP1 Windows Embedded 8 Standard WEPOS 1.1 SP3 POSReady 2009 Windows Embedded POSReady 7 Windows Fundamentals for Legacy PCs 7
WMI Namespace	root\Microsoft\WriteFilters
WMI Provider	FBWFProvider

See Also

Concepts

File-Based Write Filter WMI Provider Reference