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TrFile_UnmountDisk (function reference)

By June 1, 2024June 4th, 2024Online Help, Troi File Plug-in
Troi File Plug-in > Functions reference > TrFile_UnmountDisk
Troi File Plug-in for FileMaker Pro


Unmounts and ejects a remote or removable disk.

SyntaxFunction badge

TrFile_UnmountDisk ( switches ; diskname )


switches not used, reserved for future use. Leave blank or put "-Unused"
diskname the name of the disk to be unmounted or ejected

Returned Result

Data type returned

Error code


The returned result is an error code. An error always starts with 2 dollars, followed by the error code. You should always check for errors. Returned error codes can be:

0 no error The disk was ejected.
$$-35 nsVolErr No such volume (Wrong disk name or not mounted).
$$-47 fBsyErr The disk is in use.
$$-5010 afpFileBusy Can’t eject as the disk is being shared.

Other errors may be returned.

Originated in

Troi File Plug-in 2.0


FileMaker Pro 17 to FileMaker Pro 21 (2024)


On macOS it is possible to have multiple disks with the same name. In this case the function will unmount the first disk that matches the diskname.

Since version 2.6 this function is also available on Windows. However it does not physically eject removable media, like a CD-ROM.


Set Field [ result ; TrFile_UnmountDisk ( "-Unused"; "Mac HD:" ) ]

This will eject the hard disk “Mac HD”, provided it is not the startup disk. On Windows an example is:

Set Field [ result ; TrFile_UnmountDisk ( "-Unused"; "K:" ) ]

This will unmount the mapped drive “K:”

Example 2

We assume that in your FileMaker file the following fields are defined:

  gErrorCode		Global, number
  gDiskName		Global, text

gFilePath should contain the path to the disk, for example “Archive CD:” (Mac). In a script add the following script step, which will eject the disk specified by gDiskName:

Set Field [ gErrorCode ; TrFile_UnmountDisk ( "-Unused" ; gDiskName ) ]

Used in example file


Related functionsFunction badge


Related script stepScript step badge

Unmount Disk

Related topics

Troi File Plug-in online help (overview)

Online Help Page for Troi File Plug-in for 17 to 2024 –> TrFile_UnmountDisk (filep4290) 2024-0604 19:40:43