diff --git a/Enums/ErrorNumber.cs b/Enums/ErrorNumber.cs
index 4b6890a..fa0dfeb 100644
--- a/Enums/ErrorNumber.cs
+++ b/Enums/ErrorNumber.cs
@@ -38,9 +38,81 @@
 
 namespace Aaru.CommonTypes.Enums
 {
-    /// <summary>Enumerates error codes. Positive for warnings or informative codes, negative for errors.</summary>
+    /// <summary>Enumerates error codes. Negative for UNIX error number equivalents, positive for Aaru error numbers.</summary>
     public enum ErrorNumber
     {
+        NotPermitted = -1,
+        /// <summary>No such file or directory</summary>
+        NoSuchFile = -2, NoSuchProcess = -3, InterruptedSyscall = -4,
+        /// <summary>I/O error</summary>
+        InOutError = -5, NoSuchDeviceOrAddress = -6, ArgumentListTooLong = -7, ExecutableFormatError = -8,
+        BadFileNumber                          = -9, NoChildProcess      = -10, TryAgain             = -11,
+        OutOfMemory                            = -12,
+        /// <summary>Access denied</summary>
+        AccessDenied = -13, BadAddress = -14, NotABlockDevice = -15,
+        /// <summary>Busy, cannot complete</summary>
+        Busy = -16, FileExists = -17, CrossDeviceLink = -18,
+        /// <summary>No such device</summary>
+        NoSuchDevice = -19,
+        /// <summary>Is not a directory (e.g.: trying to ReadDir() a file)</summary>
+        NotDirectory = -20,
+        /// <summary>Is a directory (e.g.: trying to Read() a dir)</summary>
+        IsDirectory = -21,
+        /// <summary>Invalid argument</summary>
+        InvalidArgument = -22, FileTableOverflow = -23, TooManyOpenFiles = -24, NotTypewriter = -25,
+        TextFileBusy                             = -26,
+        /// <summary>File is too large</summary>
+        FileTooLarge = -27, NoSpaceLeft = -28, IllegalSeek        = -29, ReadOnly    = -30,
+        TooManyLinks                    = -31, BrokenPipe         = -32, OutOfDomain = -33,
+        OutOfRange                      = -34, DeadlockWouldOccur = -35,
+        /// <summary>Name is too long</summary>
+        NameTooLong = -36, NoLocksAvailable = -37,
+        /// <summary>Not implemented</summary>
+        NotImplemented = -38,
+        /// <summary>There is no data available</summary>
+        NoData = -61,
+        /// <summary>Link is severed</summary>
+        SeveredLink = -67,
+        /// <summary>There is no such attribute</summary>
+        NoSuchExtendedAttribute = NoData,
+        /// <summary>Not supported</summary>
+        NotSupported = -252, EPERM = NotPermitted,
+        /// <summary>No such file or directory</summary>
+        ENOENT = NoSuchFile, ESRCH = NoSuchProcess, EINTR = InterruptedSyscall,
+        /// <summary>I/O error</summary>
+        EIO = InOutError, ENXIO = NoSuchDeviceOrAddress, E2BIG = ArgumentListTooLong, ENOEXEC = ExecutableFormatError,
+        EBADF                   = BadFileNumber, ECHILD        = NoChildProcess, EAGAIN       = TryAgain,
+        ENOMEM                  = OutOfMemory,
+        /// <summary>Access denied</summary>
+        EACCES = AccessDenied, EFAULT = BadAddress, ENOTBLK = NotABlockDevice,
+        /// <summary>Busy, cannot complete</summary>
+        EBUSY = Busy, EEXIST = FileExists, EXDEV = CrossDeviceLink,
+        /// <summary>No such device</summary>
+        ENODEV = NoSuchDevice,
+        /// <summary>Is not a directory (e.g.: trying to ReadDir() a file)</summary>
+        ENOTDIR = NotDirectory,
+        /// <summary>Is a directory (e.g.: trying to Read() a dir)</summary>
+        EISDIR = IsDirectory,
+        /// <summary>Invalid argument</summary>
+        EINVAL = InvalidArgument, ENFILE = FileTableOverflow, EMFILE = TooManyOpenFiles, ENOTTY = NotTypewriter,
+        ETXTBSY                          = TextFileBusy,
+        /// <summary>File is too large</summary>
+        EFBIG = FileTooLarge, ENOSPC = NoSpaceLeft, ESPIPE = IllegalSeek, EROFS = ReadOnly,
+        EMLINK                       = TooManyLinks, EPIPE = BrokenPipe, EDOM   = OutOfDomain,
+        ERANGE                       = OutOfRange, EDEADLK = DeadlockWouldOccur,
+        /// <summary>Name is too long</summary>
+        ENAMETOOLONG = NameTooLong, ENOLCK = NoLocksAvailable,
+        /// <summary>Not implemented</summary>
+        ENOSYS = NotImplemented,
+        /// <summary>Link is severed</summary>
+        ENOLINK = SeveredLink,
+        /// <summary>Not supported</summary>
+        ENOTSUP = NotSupported, DirectoryNotEmpty = -39, TooManySymbolicLinks = -40, ENOTEMPTY = DirectoryNotEmpty,
+        ELOOP                                     = TooManySymbolicLinks,
+        /// <summary>There is no such attribute</summary>
+        ENOATTR = NoSuchExtendedAttribute,
+        /// <summary>There is no data available</summary>
+        ENODATA = NoData,
         /// <summary>No error</summary>
         NoError = 0,
         /// <summary>User requested help to be shown</summary>
@@ -66,50 +138,38 @@ namespace Aaru.CommonTypes.Enums
         /// <summary>Image is good and there are bad sectors</summary>
         CorrectImageBadSectors = 11,
         /// <summary>Exception has been raised</summary>
-        UnexpectedException = -1,
+        UnexpectedException = 12,
         /// <summary>The number of arguments is not as expected</summary>
-        UnexpectedArgumentCount = -2,
+        UnexpectedArgumentCount = 13,
         /// <summary>A required argument is not present</summary>
-        MissingArgument = -3,
-        /// <summary>A specified argument contains an invalid value</summary>
-        InvalidArgument = -4,
-        /// <summary>The specified file cannot be found</summary>
-        FileNotFound = -5,
+        MissingArgument = 14,
         /// <summary>The specified file cannot be opened</summary>
-        CannotOpenFile = -6,
+        CannotOpenFile = 15,
         /// <summary>The specified encoding cannot be found</summary>
-        EncodingUnknown = -7,
+        EncodingUnknown = 16,
         /// <summary>The image format has not been recognized</summary>
-        UnrecognizedFormat = -8,
+        UnrecognizedFormat = 17,
         /// <summary>The image format failed to open</summary>
-        CannotOpenFormat = -9,
+        CannotOpenFormat = 18,
         /// <summary>The specified metadata sidecar does not have the correct format</summary>
-        InvalidSidecar = -10,
+        InvalidSidecar = 19,
         /// <summary>The specified resume map does not have the correct format</summary>
-        InvalidResume = -11,
-        /// <summary>The specified destination file/folder already exists</summary>
-        DestinationExists = -12,
+        InvalidResume = 20,
         /// <summary>The specified image format cannot be found</summary>
-        FormatNotFound = -13,
+        FormatNotFound = 21,
         /// <summary>More than one format found for the specified search criteria</summary>
-        TooManyFormats = -14,
+        TooManyFormats = 22,
         /// <summary>The specified format does not support the specified media</summary>
-        UnsupportedMedia = -15,
+        UnsupportedMedia = 23,
         /// <summary>Data will be lost writing the specified format</summary>
-        DataWillBeLost = -16,
+        DataWillBeLost = 24,
         /// <summary>Cannot create destination format</summary>
-        CannotCreateFormat = -17,
+        CannotCreateFormat = 25,
         /// <summary>Error writing data</summary>
-        WriteError = -18,
-        /// <summary>Argument expected a directory, but found a file</summary>
-        ExpectedDirectory = -19,
-        /// <summary>Argument expected a file, but found a directory</summary>
-        ExpectedFile = -20,
+        WriteError = 26,
         /// <summary>Cannot open device</summary>
-        CannotOpenDevice = -21,
-        /// <summary>The specified operation requires administrative privileges</summary>
-        NotEnoughPermissions = -22,
+        CannotOpenDevice = 27,
         /// <summary>Cannot remove the existing database</summary>
-        CannotRemoveDatabase = -23
+        CannotRemoveDatabase = -28
     }
 }
\ No newline at end of file
diff --git a/Filters.cs b/Filters.cs
index 3cff3ce..47c2744 100644
--- a/Filters.cs
+++ b/Filters.cs
@@ -41,8 +41,8 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using Aaru.CommonTypes.Enums;
 using Aaru.CommonTypes.Interfaces;
-using Aaru.CommonTypes.Structs;
 using Aaru.Console;
 
 namespace Aaru.CommonTypes
@@ -94,7 +94,7 @@ namespace Aaru.CommonTypes
                         var foundFilter = (IFilter)filter.GetType().GetConstructor(Type.EmptyTypes)?.Invoke(new object[]
                             {});
 
-                        if(foundFilter?.Open(path) == Errno.NoError)
+                        if(foundFilter?.Open(path) == ErrorNumber.NoError)
                             return foundFilter;
                     }
                     else
diff --git a/Interfaces/IFilter.cs b/Interfaces/IFilter.cs
index eb6d863..f75ab10 100644
--- a/Interfaces/IFilter.cs
+++ b/Interfaces/IFilter.cs
@@ -38,7 +38,7 @@
 
 using System;
 using System.IO;
-using Aaru.CommonTypes.Structs;
+using Aaru.CommonTypes.Enums;
 
 namespace Aaru.CommonTypes.Interfaces
 {
@@ -134,14 +134,14 @@ namespace Aaru.CommonTypes.Interfaces
 
         /// <summary>Opens the specified path with this filter instance</summary>
         /// <param name="path">Path.</param>
-        Errno Open(string path);
+        ErrorNumber Open(string path);
 
         /// <summary>Opens the specified stream with this filter instance</summary>
         /// <param name="stream">Stream.</param>
-        Errno Open(Stream stream);
+        ErrorNumber Open(Stream stream);
 
         /// <summary>Opens the specified buffer with this filter instance</summary>
         /// <param name="buffer">Buffer.</param>
-        Errno Open(byte[] buffer);
+        ErrorNumber Open(byte[] buffer);
     }
 }
\ No newline at end of file
diff --git a/Interfaces/IReadOnlyFilesystem.cs b/Interfaces/IReadOnlyFilesystem.cs
index c6d188b..72e3275 100644
--- a/Interfaces/IReadOnlyFilesystem.cs
+++ b/Interfaces/IReadOnlyFilesystem.cs
@@ -40,6 +40,7 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
+using Aaru.CommonTypes.Enums;
 using Aaru.CommonTypes.Structs;
 
 namespace Aaru.CommonTypes.Interfaces
@@ -63,62 +64,62 @@ namespace Aaru.CommonTypes.Interfaces
         /// <param name="encoding">Which encoding to use for this filesystem.</param>
         /// <param name="options">Dictionary of key=value pairs containing options to pass to the filesystem</param>
         /// <param name="namespace">Filename namespace</param>
-        Errno Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding, Dictionary<string, string> options,
-                    string @namespace);
+        ErrorNumber Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding,
+                          Dictionary<string, string> options, string @namespace);
 
         /// <summary>Frees all internal structures created by <see cref="Mount" /></summary>
-        Errno Unmount();
+        ErrorNumber Unmount();
 
         /// <summary>Maps a filesystem block from a file to a block from the underlying device.</summary>
         /// <returns>Error number.</returns>
         /// <param name="path">File path.</param>
         /// <param name="fileBlock">File block.</param>
         /// <param name="deviceBlock">Device block.</param>
-        Errno MapBlock(string path, long fileBlock, out long deviceBlock);
+        ErrorNumber MapBlock(string path, long fileBlock, out long deviceBlock);
 
         /// <summary>Gets the attributes of a file or directory</summary>
         /// <returns>Error number.</returns>
         /// <param name="path">File path.</param>
         /// <param name="attributes">File attributes.</param>
-        Errno GetAttributes(string path, out FileAttributes attributes);
+        ErrorNumber GetAttributes(string path, out FileAttributes attributes);
 
         /// <summary>Lists all extended attributes, alternate data streams and forks of the given file.</summary>
         /// <returns>Error number.</returns>
         /// <param name="path">Path.</param>
         /// <param name="xattrs">List of extended attributes, alternate data streams and forks.</param>
-        Errno ListXAttr(string path, out List<string> xattrs);
+        ErrorNumber ListXAttr(string path, out List<string> xattrs);
 
         /// <summary>Reads an extended attribute, alternate data stream or fork from the given file.</summary>
         /// <returns>Error number.</returns>
         /// <param name="path">File path.</param>
         /// <param name="xattr">Extended attribute, alternate data stream or fork name.</param>
         /// <param name="buf">Buffer.</param>
-        Errno GetXattr(string path, string xattr, ref byte[] buf);
+        ErrorNumber GetXattr(string path, string xattr, ref byte[] buf);
 
         /// <summary>Reads data from a file (main/only data stream or data fork).</summary>
         /// <param name="path">File path.</param>
         /// <param name="offset">Offset.</param>
         /// <param name="size">Bytes to read.</param>
         /// <param name="buf">Buffer.</param>
-        Errno Read(string path, long offset, long size, ref byte[] buf);
+        ErrorNumber Read(string path, long offset, long size, ref byte[] buf);
 
         /// <summary>Lists contents from a directory.</summary>
         /// <param name="path">Directory path.</param>
         /// <param name="contents">Directory contents.</param>
-        Errno ReadDir(string path, out List<string> contents);
+        ErrorNumber ReadDir(string path, out List<string> contents);
 
         /// <summary>Gets information about the mounted volume.</summary>
         /// <param name="stat">Information about the mounted volume.</param>
-        Errno StatFs(out FileSystemInfo stat);
+        ErrorNumber StatFs(out FileSystemInfo stat);
 
         /// <summary>Gets information about a file or directory.</summary>
         /// <param name="path">File path.</param>
         /// <param name="stat">File information.</param>
-        Errno Stat(string path, out FileEntryInfo stat);
+        ErrorNumber Stat(string path, out FileEntryInfo stat);
 
         /// <summary>Solves a symbolic link.</summary>
         /// <param name="path">Link path.</param>
         /// <param name="dest">Link destination.</param>
-        Errno ReadLink(string path, out string dest);
+        ErrorNumber ReadLink(string path, out string dest);
     }
 }
\ No newline at end of file
diff --git a/Structs/Filesystems.cs b/Structs/Filesystems.cs
index fb2a796..985ced8 100644
--- a/Structs/Filesystems.cs
+++ b/Structs/Filesystems.cs
@@ -38,7 +38,6 @@
 // ****************************************************************************/
 
 using System;
-using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
 using Newtonsoft.Json;
 
@@ -279,72 +278,4 @@ namespace Aaru.CommonTypes.Structs
         [FieldOffset(3)]
         public Guid uuid;
     }
-
-    /// <summary>Errors</summary>
-    [SuppressMessage("ReSharper", "InconsistentNaming")]
-    public enum Errno
-    {
-        /// <summary>No error happened</summary>
-        NoError = 0,
-        /// <summary>Access denied</summary>
-        AccessDenied = -13,
-        /// <summary>Busy, cannot complete</summary>
-        Busy = -16,
-        /// <summary>File is too large</summary>
-        FileTooLarge = -27,
-        /// <summary>Invalid argument</summary>
-        InvalidArgument = -22,
-        /// <summary>I/O error</summary>
-        InOutError = -5,
-        /// <summary>Is a directory (e.g.: trying to Read() a dir)</summary>
-        IsDirectory = -21,
-        /// <summary>Name is too long</summary>
-        NameTooLong = -36,
-        /// <summary>There is no data available</summary>
-        NoData = 61,
-        /// <summary>There is no such attribute</summary>
-        NoSuchExtendedAttribute = NoData,
-        /// <summary>No such device</summary>
-        NoSuchDevice = -19,
-        /// <summary>No such file or directory</summary>
-        NoSuchFile = -2,
-        /// <summary>Is not a directory (e.g.: trying to ReadDir() a file)</summary>
-        NotDirectory = -20,
-        /// <summary>Not implemented</summary>
-        NotImplemented = -38,
-        /// <summary>Not supported</summary>
-        NotSupported = -252,
-        /// <summary>Link is severed</summary>
-        SeveredLink = -67,
-        /// <summary>Access denied</summary>
-        EACCES = AccessDenied,
-        /// <summary>Busy, cannot complete</summary>
-        EBUSY = Busy,
-        /// <summary>File is too large</summary>
-        EFBIG = FileTooLarge,
-        /// <summary>Invalid argument</summary>
-        EINVAL = InvalidArgument,
-        /// <summary>I/O error</summary>
-        EIO = InOutError,
-        /// <summary>Is a directory (e.g.: trying to Read() a dir)</summary>
-        EISDIR = IsDirectory,
-        /// <summary>Name is too long</summary>
-        ENAMETOOLONG = NameTooLong,
-        /// <summary>There is no such attribute</summary>
-        ENOATTR = NoSuchExtendedAttribute,
-        /// <summary>There is no data available</summary>
-        ENODATA = NoData,
-        /// <summary>No such device</summary>
-        ENODEV = NoSuchDevice,
-        /// <summary>No such file or directory</summary>
-        ENOENT = NoSuchFile,
-        /// <summary>Link is severed</summary>
-        ENOLINK = SeveredLink,
-        /// <summary>Not implemented</summary>
-        ENOSYS = NotImplemented,
-        /// <summary>Is not a directory (e.g.: trying to ReadDir() a file)</summary>
-        ENOTDIR = NotDirectory,
-        /// <summary>Not supported</summary>
-        ENOTSUP = NotSupported
-    }
 }
\ No newline at end of file