2.5.10 FileFsDeviceInformation
This information class is used to query device information associated with a file system volume.
A FILE_FS_DEVICE_INFORMATION data element, defined as follows, is returned by the server.
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DeviceType |
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Characteristics |
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DeviceType (4 bytes): This identifies the type of given volume. It MUST be one of the following.
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Value
Meaning
FILE_DEVICE_CD_ROM
0x00000002
Volume resides on a CD ROM.
FILE_DEVICE_DISK
0x00000007
Volume resides on a disk.
Characteristics (4 bytes): A bit field which identifies various characteristics about a given volume. The following are valid bit values.
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Value
Meaning
FILE_REMOVABLE_MEDIA
0x00000001
Indicates that the storage device supports removable media. Notice that this characteristic indicates removable media, not a removable device. For example, drivers for JAZ drive devices specify this characteristic, but drivers for PCMCIA flash disks do not.
FILE_READ_ONLY_DEVICE
0x00000002
Indicates that the device cannot be written to.
FILE_FLOPPY_DISKETTE
0x00000004
Indicates that the device is a floppy disk device.
FILE_WRITE_ONCE_MEDIA
0x00000008
Indicates that the device supports write-once media.
FILE_REMOTE_DEVICE
0x00000010
Indicates that the volume is for a remote file system like SMB or CIFS.
FILE_DEVICE_IS_MOUNTED
0x00000020
Indicates that a file system is mounted on the device.
FILE_VIRTUAL_VOLUME
0x00000040
Indicates that the volume does not directly reside on storage media but resides on some other type of media (memory for example).
FILE_DEVICE_SECURE_OPEN
0x00000100
By default, volumes do not check the ACL associated with the volume, but instead use the ACLs associated with individual files on the volume. When this flag is set the volume ACL is also checked.
FILE_CHARACTERISTIC_TS_DEVICE
0x00001000
Indicates that the device object is part of a Terminal Services device stack. See [MS-RDPBCGR] for more information.
FILE_CHARACTERISTIC_WEBDAV_DEVICE
0x00002000
Indicates that a web-based Distributed Authoring and Versioning (WebDAV) file system is mounted on the device. See [MS-WDVME] for more information.
FILE_DEVICE_ALLOW_APPCONTAINER_TRAVERSAL
0x00020000
The IO Manager normally performs a full security check for traverse access on every file open when the client is an appcontainer. Setting of this flag bypasses this enforced traverse access check if the client token already has traverse privileges.<173>
FILE_PORTABLE_DEVICE
0x0004000
Indicates that the given device resides on a portable bus like USB or Firewire and that the entire device (not just the media) can be removed from the system.
This operation returns a status code as specified in section 2.2. Upon success, the status code returned by the function that processes this file system information class is STATUS_SUCCESS. The most common error codes are listed in the following table.
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Error code |
Meaning |
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STATUS_INFO_LENGTH_MISMATCH 0xC0000004 |
The specified information record length does not match the length that is required for the specified information class. |