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<blockquote data-quote="stulish" data-source="post: 172448" data-attributes="member: 46875">Hi Guys,I am getting an error on a program i created, the program seems to work great so i started trying to cause problems (as users will generally do), I have found i can get it to crash if i remove the removable USB drive while it is compressing data to it, below is a small program i created to generate an error i have been having within the larger program (if anyone wants to try it and see):It just needs one Button and two labels on a form and System.IO.Compression and System.IO.Compression.FileSystem added as references.[CODE]Imports System.Windows.FormsImports SystemImports System.Runtime.InteropServicesImports System.ComponentModelImports System.IOImports System.IO.CompressionImports System.IO.DriveInfoImports System.ManagementImports System.XmlImports System.ThreadingPublic Class Form1&nbsp; &nbsp; Private WithEvents bw As BackgroundWorker = New BackgroundWorker&nbsp; &nbsp; Dim SaveLoc As String = &quot;E:\&quot;&nbsp; &nbsp; Dim startedCompress As Boolean = False&nbsp; &nbsp; Delegate Sub SetTextCallback([text] As String)&nbsp; &nbsp; Private demoThread As Thread = Nothing&nbsp; &nbsp; Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click&nbsp; &nbsp; &nbsp; &nbsp; Try&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.RunWorkerAsync()&nbsp; &nbsp; &nbsp; &nbsp; Catch ex As Exception&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SetText2(DateTime.Now.ToString &amp; &quot; - Could not Compress files1: &quot; &amp; ex.Message)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.CancelAsync()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.Dispose()&nbsp; &nbsp; &nbsp; &nbsp; End Try&nbsp; &nbsp; End Sub&nbsp; &nbsp; Private Sub SetText1(ByVal [text] As String)&nbsp; &nbsp; &nbsp; &nbsp; ' InvokeRequired required compares the thread ID of the&nbsp; &nbsp; &nbsp; &nbsp; ' calling thread to the thread ID of the creating thread.&nbsp; &nbsp; &nbsp; &nbsp; ' If these threads are different, it returns true.&nbsp; &nbsp; &nbsp; &nbsp; If Label1.InvokeRequired Then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim d As New SetTextCallback(AddressOf SetText1)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Me.Invoke(d, New Object() {[text]})&nbsp; &nbsp; &nbsp; &nbsp; Else&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Label1.Text = [text]&nbsp; &nbsp; &nbsp; &nbsp; End If&nbsp; &nbsp; End Sub&nbsp; &nbsp; Private Sub SetText2(ByVal [text] As String)&nbsp; &nbsp; &nbsp; &nbsp; ' InvokeRequired required compares the thread ID of the&nbsp; &nbsp; &nbsp; &nbsp; ' calling thread to the thread ID of the creating thread.&nbsp; &nbsp; &nbsp; &nbsp; ' If these threads are different, it returns true.&nbsp; &nbsp; &nbsp; &nbsp; If Label2.InvokeRequired Then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim d As New SetTextCallback(AddressOf SetText2)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Me.Invoke(d, New Object() {[text]})&nbsp; &nbsp; &nbsp; &nbsp; Else&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Label2.Text = [text]&nbsp; &nbsp; &nbsp; &nbsp; End If&nbsp; &nbsp; End Sub&nbsp; &nbsp; Private Sub doCompress(ByVal fn As String)&nbsp; &nbsp; &nbsp; &nbsp; Try&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; If Directory.Exists(Mid$(SaveLoc, 1, 3)) Then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; startedCompress = True&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; If Not (fn.Contains(&quot;TestAudio&quot;)) And fn &lt;&gt; &quot;&quot; Then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim fileName As String = System.IO.Path.GetFileName(fn)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim dirname As String = DateTime.Now.ToString(&quot;yyyyMMdd-HHmmss&quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; If My.Computer.FileSystem.DirectoryExists(SaveLoc &amp; &quot;\&quot; &amp; dirname) = False Then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; My.Computer.FileSystem.CreateDirectory(SaveLoc &amp; &quot;\&quot; &amp; dirname)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End If&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim wavCompressname = &quot;SND-&quot; &amp; fileName &amp; &quot;.zip&quot;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim wavName = fileName &amp; &quot;.wav&quot;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 'Do Audio&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; If System.IO.File.Exists(SaveLoc &amp; wavCompressname) Then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.IO.File.Delete(SaveLoc &amp; wavCompressname)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End If&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim audDir As String = fn &amp; &quot;\&quot;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dim ZipDir As String = SaveLoc &amp; dirname &amp; &quot;\&quot; &amp; wavCompressname&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ' Debug.Print(&quot;-------------------------------------------------&quot; &amp; fileName &amp; &quot;--------------------------&quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 'Debug.Print(DateTime.Now.ToString &amp; &quot;&nbsp; &nbsp; -&nbsp; &nbsp; Start Compress&quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; If File.Exists(ZipDir) Then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ZipDir = ZipDir.Replace(&quot;.zip&quot;, &quot;-1.zip&quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; '&nbsp;&nbsp; Debug.Print(&quot;file exists - renameing file to: &quot; &amp; ZipDir)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End If&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Try&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ZipFile.CreateFromDirectory(audDir, ZipDir, CompressionLevel.Optimal, False)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Catch ex As Exception&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SetText2(DateTime.Now.ToString &amp; &quot; - Zip Error&quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.CancelAsync()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.Dispose()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End Try&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; startedCompress = False&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End If&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End If&nbsp; &nbsp; &nbsp; &nbsp; Catch dirNotFound As System.IO.DirectoryNotFoundException&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ' Code to handle DirectoryNotFoundException. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SetText2(DateTime.Now.ToString &amp; &quot; - Directory Not Found: &quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.CancelAsync()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.Dispose()&nbsp; &nbsp; &nbsp; &nbsp; Catch fileNotFound As System.IO.FileNotFoundException&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ' Code to handle FileNotFoundException. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SetText2(DateTime.Now.ToString &amp; &quot; - File Not Found: &quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.CancelAsync()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.Dispose()&nbsp; &nbsp; &nbsp; &nbsp; Catch *********** As System.IO.***********Exception&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ' Code to handle ***********Exception. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SetText2(DateTime.Now.ToString &amp; &quot; - Path Too Long: &quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.CancelAsync()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.Dispose()&nbsp; &nbsp; &nbsp; &nbsp; Catch ioEx As System.IO.IOException&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ' Code to handle IOException. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SetText2(DateTime.Now.ToString &amp; &quot; - IO: &quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.CancelAsync()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.Dispose()&nbsp; &nbsp; &nbsp; &nbsp; Catch security As System.Security.SecurityException&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ' Code to handle SecurityException. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SetText2(DateTime.Now.ToString &amp; &quot; - Security: &quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.CancelAsync()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.Dispose()&nbsp; &nbsp; &nbsp; &nbsp; Catch ex As Exception&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SetText2(DateTime.Now.ToString &amp; &quot; - Could not Compress files: &quot; &amp; ex.Message)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.CancelAsync()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.Dispose()&nbsp; &nbsp; &nbsp; &nbsp; End Try&nbsp; &nbsp; End Sub&nbsp; &nbsp; Private Sub Form1_Load(sender As Object, e As EventArgs) Handles Me.Load&nbsp; &nbsp; &nbsp; &nbsp; bw.WorkerSupportsCancellation = True&nbsp; &nbsp; &nbsp; &nbsp; bw.WorkerReportsProgress = True&nbsp; &nbsp; &nbsp; &nbsp; AddHandler bw.DoWork, AddressOf bw_DoWork&nbsp; &nbsp; &nbsp; &nbsp; AddHandler bw.RunWorkerCompleted, AddressOf bw_RunWorkerCompleted&nbsp; &nbsp; End Sub&nbsp; &nbsp; Private Sub bw_DoWork(sender As Object, e As DoWorkEventArgs) Handles bw.DoWork&nbsp; &nbsp; &nbsp; &nbsp; SetText1(DateTime.Now.ToString &amp; &quot; - BW Started&quot;)&nbsp; &nbsp; &nbsp; &nbsp; Try&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; If bw.CancellationPending = True Then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; e.Cancel = True&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Else&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 'do work&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; doCompress(&quot;C:\Temp\Test&quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; End If&nbsp; &nbsp; &nbsp; &nbsp; Catch ex As Exception&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Debug.Print(DateTime.Now.ToString &amp; &quot; - Unable to start background worker thread: &quot; &amp; ex.Message)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.CancelAsync()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; bw.Dispose()&nbsp; &nbsp; &nbsp; &nbsp; End Try&nbsp; &nbsp; End Sub&nbsp; &nbsp; Private Sub bw_ProgressChanged(sender As Object, e As ProgressChangedEventArgs) Handles bw.ProgressChanged&nbsp; &nbsp; &nbsp; &nbsp; SetText2(&quot;Prog Changed&quot;)&nbsp; &nbsp; End Sub&nbsp; &nbsp; Private Sub bw_RunWorkerCompleted(sender As Object, e As RunWorkerCompletedEventArgs) Handles bw.RunWorkerCompleted&nbsp; &nbsp; &nbsp; &nbsp; SetText1(DateTime.Now.ToString &amp; &quot; - BW Complete&quot;)&nbsp; &nbsp; End SubEnd Class[/CODE]I put some stuff into the &quot;C:\Temp\Test&quot; directory, this will be&nbsp; zipped onto the flash drive located in the SaveLoc variable in this case&nbsp; &quot;E:&quot; when the button is clicked, make sure there is enough in the temp\test directory to take a&nbsp; little time to compress, i have about 23MB of images and audio this&nbsp; takes about 4-6 seconds to compress and save the files.Once you click the button wait a second and then remove the USB flash&nbsp; drive (please use a clean drive as i would hate for anything you have on&nbsp; the drive becoming corrupt due to bad removal).&nbsp; I have had to do this 3&nbsp; or 4 times before it shows the error below:[ATTACH]4323[/ATTACH]The immediate window shows:The other error message i can get is still a IOException but the detail is: 'The&nbsp; volume for a file has been externally altered so that the opened file is&nbsp; no longer valid.'I know people shouldn't remove USD brives while they are being written too, but i expect some users will and then moan that the app crashes.I have checked the Exceptions settings in the IDE and nothing is checked:[ATTACH]4324[/ATTACH]so i dont understand how sometimes it can be removed with no error and the try/catch working to catch the problem and other times it crashed the program.Any ideas would be welcome.RegardsStu</blockquote>

[QUOTE="stulish, post: 172448, member: 46875"] Hi Guys, I am getting an error on a program i created, the program seems to work great so i started trying to cause problems (as users will generally do), I have found i can get it to crash if i remove the removable USB drive while it is compressing data to it, below is a small program i created to generate an error i have been having within the larger program (if anyone wants to try it and see): It just needs one Button and two labels on a form and System.IO.Compression and System.IO.Compression.FileSystem added as references. [CODE] Imports System.Windows.Forms Imports System Imports System.Runtime.InteropServices Imports System.ComponentModel Imports System.IO Imports System.IO.Compression Imports System.IO.DriveInfo Imports System.Management Imports System.Xml Imports System.Threading Public Class Form1 Private WithEvents bw As BackgroundWorker = New BackgroundWorker Dim SaveLoc As String = "E:\" Dim startedCompress As Boolean = False Delegate Sub SetTextCallback([text] As String) Private demoThread As Thread = Nothing Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click Try bw.RunWorkerAsync() Catch ex As Exception SetText2(DateTime.Now.ToString & " - Could not Compress files1: " & ex.Message) bw.CancelAsync() bw.Dispose() End Try End Sub Private Sub SetText1(ByVal [text] As String) ' InvokeRequired required compares the thread ID of the ' calling thread to the thread ID of the creating thread. ' If these threads are different, it returns true. If Label1.InvokeRequired Then Dim d As New SetTextCallback(AddressOf SetText1) Me.Invoke(d, New Object() {[text]}) Else Label1.Text = [text] End If End Sub Private Sub SetText2(ByVal [text] As String) ' InvokeRequired required compares the thread ID of the ' calling thread to the thread ID of the creating thread. ' If these threads are different, it returns true. If Label2.InvokeRequired Then Dim d As New SetTextCallback(AddressOf SetText2) Me.Invoke(d, New Object() {[text]}) Else Label2.Text = [text] End If End Sub Private Sub doCompress(ByVal fn As String) Try If Directory.Exists(Mid$(SaveLoc, 1, 3)) Then startedCompress = True If Not (fn.Contains("TestAudio")) And fn <> "" Then Dim fileName As String = System.IO.Path.GetFileName(fn) Dim dirname As String = DateTime.Now.ToString("yyyyMMdd-HHmmss") If My.Computer.FileSystem.DirectoryExists(SaveLoc & "\" & dirname) = False Then My.Computer.FileSystem.CreateDirectory(SaveLoc & "\" & dirname) End If Dim wavCompressname = "SND-" & fileName & ".zip" Dim wavName = fileName & ".wav" 'Do Audio If System.IO.File.Exists(SaveLoc & wavCompressname) Then System.IO.File.Delete(SaveLoc & wavCompressname) End If Dim audDir As String = fn & "\" Dim ZipDir As String = SaveLoc & dirname & "\" & wavCompressname ' Debug.Print("-------------------------------------------------" & fileName & "--------------------------") 'Debug.Print(DateTime.Now.ToString & " - Start Compress") If File.Exists(ZipDir) Then ZipDir = ZipDir.Replace(".zip", "-1.zip") ' Debug.Print("file exists - renameing file to: " & ZipDir) End If Try ZipFile.CreateFromDirectory(audDir, ZipDir, CompressionLevel.Optimal, False) Catch ex As Exception SetText2(DateTime.Now.ToString & " - Zip Error") bw.CancelAsync() bw.Dispose() End Try startedCompress = False End If End If Catch dirNotFound As System.IO.DirectoryNotFoundException ' Code to handle DirectoryNotFoundException. SetText2(DateTime.Now.ToString & " - Directory Not Found: ") bw.CancelAsync() bw.Dispose() Catch fileNotFound As System.IO.FileNotFoundException ' Code to handle FileNotFoundException. SetText2(DateTime.Now.ToString & " - File Not Found: ") bw.CancelAsync() bw.Dispose() Catch *********** As System.IO.***********Exception ' Code to handle ***********Exception. SetText2(DateTime.Now.ToString & " - Path Too Long: ") bw.CancelAsync() bw.Dispose() Catch ioEx As System.IO.IOException ' Code to handle IOException. SetText2(DateTime.Now.ToString & " - IO: ") bw.CancelAsync() bw.Dispose() Catch security As System.Security.SecurityException ' Code to handle SecurityException. SetText2(DateTime.Now.ToString & " - Security: ") bw.CancelAsync() bw.Dispose() Catch ex As Exception SetText2(DateTime.Now.ToString & " - Could not Compress files: " & ex.Message) bw.CancelAsync() bw.Dispose() End Try End Sub Private Sub Form1_Load(sender As Object, e As EventArgs) Handles Me.Load bw.WorkerSupportsCancellation = True bw.WorkerReportsProgress = True AddHandler bw.DoWork, AddressOf bw_DoWork AddHandler bw.RunWorkerCompleted, AddressOf bw_RunWorkerCompleted End Sub Private Sub bw_DoWork(sender As Object, e As DoWorkEventArgs) Handles bw.DoWork SetText1(DateTime.Now.ToString & " - BW Started") Try If bw.CancellationPending = True Then e.Cancel = True Else 'do work doCompress("C:\Temp\Test") End If Catch ex As Exception Debug.Print(DateTime.Now.ToString & " - Unable to start background worker thread: " & ex.Message) bw.CancelAsync() bw.Dispose() End Try End Sub Private Sub bw_ProgressChanged(sender As Object, e As ProgressChangedEventArgs) Handles bw.ProgressChanged SetText2("Prog Changed") End Sub Private Sub bw_RunWorkerCompleted(sender As Object, e As RunWorkerCompletedEventArgs) Handles bw.RunWorkerCompleted SetText1(DateTime.Now.ToString & " - BW Complete") End Sub End Class [/CODE] I put some stuff into the [B]"C:\Temp\Test"[/B] directory, this will be zipped onto the flash drive located in the SaveLoc variable in this case "E:" when the button is clicked, make sure there is enough in the temp\test directory to take a little time to compress, i have about 23MB of images and audio this takes about 4-6 seconds to compress and save the files. Once you click the button wait a second and then remove the USB flash drive (please use a clean drive as i would hate for anything you have on the drive becoming corrupt due to bad removal). I have had to do this 3 or 4 times before it shows the error below: [ATTACH]4323.vB[/ATTACH] The immediate window shows: The other error message i can get is still a IOException but the detail is: 'The volume for a file has been externally altered so that the opened file is no longer valid.' I know people shouldn't remove USD brives while they are being written too, but i expect some users will and then moan that the app crashes. I have checked the Exceptions settings in the IDE and nothing is checked: [ATTACH]4324.vB[/ATTACH] so i dont understand how sometimes it can be removed with no error and the try/catch working to catch the problem and other times it crashed the program. Any ideas would be welcome. Regards Stu [/QUOTE]

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