diff --git a/Source/Core/DolphinQt/CMakeLists.txt b/Source/Core/DolphinQt/CMakeLists.txt
index 6a124cd03b..0b468df466 100644
--- a/Source/Core/DolphinQt/CMakeLists.txt
+++ b/Source/Core/DolphinQt/CMakeLists.txt
@@ -18,6 +18,8 @@ add_executable(dolphin-emu
   AboutDialog.h
   CheatsManager.cpp
   CheatsManager.h
+  ConvertDialog.cpp
+  ConvertDialog.h
   DiscordHandler.cpp
   DiscordHandler.h
   DiscordJoinRequestDialog.cpp
diff --git a/Source/Core/DolphinQt/ConvertDialog.cpp b/Source/Core/DolphinQt/ConvertDialog.cpp
new file mode 100644
index 0000000000..c3e102bd7c
--- /dev/null
+++ b/Source/Core/DolphinQt/ConvertDialog.cpp
@@ -0,0 +1,217 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DolphinQt/ConvertDialog.h"
+
+#include <algorithm>
+#include <future>
+#include <utility>
+
+#include <QComboBox>
+#include <QErrorMessage>
+#include <QFileDialog>
+#include <QGridLayout>
+#include <QLabel>
+#include <QList>
+#include <QMessageBox>
+#include <QPushButton>
+#include <QString>
+#include <QVBoxLayout>
+
+#include "Common/Assert.h"
+#include "DiscIO/Blob.h"
+#include "DolphinQt/QtUtils/ModalMessageBox.h"
+#include "DolphinQt/QtUtils/ParallelProgressDialog.h"
+#include "UICommon/GameFile.h"
+
+static bool CompressCB(const std::string& text, float percent, void* ptr)
+{
+  if (ptr == nullptr)
+    return false;
+
+  auto* progress_dialog = static_cast<ParallelProgressDialog*>(ptr);
+
+  progress_dialog->SetValue(percent * 100);
+  return !progress_dialog->WasCanceled();
+}
+
+ConvertDialog::ConvertDialog(QList<std::shared_ptr<const UICommon::GameFile>> files,
+                             QWidget* parent)
+    : QDialog(parent), m_files(std::move(files))
+{
+  ASSERT(!m_files.empty());
+
+  setWindowTitle(tr("Convert"));
+  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+
+  QGridLayout* grid_layout = new QGridLayout;
+  grid_layout->setColumnStretch(1, 1);
+
+  m_format = new QComboBox;
+  AddToFormatComboBox(QStringLiteral("ISO"), DiscIO::BlobType::PLAIN);
+  AddToFormatComboBox(QStringLiteral("GCZ"), DiscIO::BlobType::GCZ);
+  grid_layout->addWidget(new QLabel(tr("Format:")), 0, 0);
+  grid_layout->addWidget(m_format, 0, 1);
+
+  QPushButton* convert_button = new QPushButton(tr("Convert"));
+
+  QVBoxLayout* main_layout = new QVBoxLayout;
+  main_layout->addLayout(grid_layout);
+  main_layout->addWidget(convert_button);
+
+  setLayout(main_layout);
+
+  connect(convert_button, &QPushButton::clicked, this, &ConvertDialog::Convert);
+}
+
+void ConvertDialog::AddToFormatComboBox(const QString& name, DiscIO::BlobType format)
+{
+  if (std::all_of(m_files.begin(), m_files.end(),
+                  [format](const auto& file) { return file->GetBlobType() == format; }))
+  {
+    return;
+  }
+
+  m_format->addItem(name, static_cast<int>(format));
+}
+
+void ConvertDialog::Convert()
+{
+  const DiscIO::BlobType format = static_cast<DiscIO::BlobType>(m_format->currentData().toInt());
+
+  const bool scrub_wii = format == DiscIO::BlobType::GCZ;
+
+  if (scrub_wii && std::any_of(m_files.begin(), m_files.end(), [](const auto& file) {
+        return file->GetPlatform() == DiscIO::Platform::WiiDisc;
+      }))
+  {
+    ModalMessageBox wii_warning(this);
+    wii_warning.setIcon(QMessageBox::Warning);
+    wii_warning.setWindowTitle(tr("Confirm"));
+    wii_warning.setText(tr("Are you sure?"));
+    wii_warning.setInformativeText(
+        tr("Compressing a Wii disc image will irreversibly change the compressed copy by removing "
+           "padding data. Your disc image will still work. Continue?"));
+    wii_warning.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+
+    if (wii_warning.exec() == QMessageBox::No)
+      return;
+  }
+
+  QString extension;
+  QString filter;
+  switch (format)
+  {
+  case DiscIO::BlobType::PLAIN:
+    extension = QStringLiteral(".iso");
+    filter = tr("Uncompressed GC/Wii images (*.iso *.gcm)");
+    break;
+  case DiscIO::BlobType::GCZ:
+    extension = QStringLiteral(".gcz");
+    filter = tr("Compressed GC/Wii images (*.gcz)");
+    break;
+  default:
+    ASSERT(false);
+    return;
+  }
+
+  QString dst_dir;
+  QString dst_path;
+
+  if (m_files.size() > 1)
+  {
+    dst_dir = QFileDialog::getExistingDirectory(
+        this, tr("Select where you want to save the converted images"),
+        QFileInfo(QString::fromStdString(m_files[0]->GetFilePath())).dir().absolutePath());
+
+    if (dst_dir.isEmpty())
+      return;
+  }
+  else
+  {
+    dst_path = QFileDialog::getSaveFileName(
+        this, tr("Select where you want to save the converted image"),
+        QFileInfo(QString::fromStdString(m_files[0]->GetFilePath()))
+            .dir()
+            .absoluteFilePath(
+                QFileInfo(QString::fromStdString(m_files[0]->GetFilePath())).completeBaseName())
+            .append(extension),
+        filter);
+
+    if (dst_path.isEmpty())
+      return;
+  }
+
+  for (const auto& file : m_files)
+  {
+    const auto original_path = file->GetFilePath();
+    if (m_files.size() > 1)
+    {
+      dst_path =
+          QDir(dst_dir)
+              .absoluteFilePath(QFileInfo(QString::fromStdString(original_path)).completeBaseName())
+              .append(extension);
+      QFileInfo dst_info = QFileInfo(dst_path);
+      if (dst_info.exists())
+      {
+        ModalMessageBox confirm_replace(this);
+        confirm_replace.setIcon(QMessageBox::Warning);
+        confirm_replace.setWindowTitle(tr("Confirm"));
+        confirm_replace.setText(tr("The file %1 already exists.\n"
+                                   "Do you wish to replace it?")
+                                    .arg(dst_info.fileName()));
+        confirm_replace.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+
+        if (confirm_replace.exec() == QMessageBox::No)
+          continue;
+      }
+    }
+
+    ParallelProgressDialog progress_dialog(tr("Converting..."), tr("Abort"), 0, 100, this);
+    progress_dialog.GetRaw()->setWindowModality(Qt::WindowModal);
+    progress_dialog.GetRaw()->setWindowTitle(tr("Progress"));
+
+    if (m_files.size() > 1)
+    {
+      progress_dialog.GetRaw()->setLabelText(
+          tr("Converting...") + QLatin1Char{'\n'} +
+          QFileInfo(QString::fromStdString(original_path)).fileName());
+    }
+
+    std::future<bool> good;
+
+    if (format == DiscIO::BlobType::PLAIN)
+    {
+      good = std::async(std::launch::async, [&] {
+        const bool good = DiscIO::ConvertToPlain(original_path, dst_path.toStdString(), &CompressCB,
+                                                 &progress_dialog);
+        progress_dialog.Reset();
+        return good;
+      });
+    }
+    else if (format == DiscIO::BlobType::GCZ)
+    {
+      good = std::async(std::launch::async, [&] {
+        const bool good =
+            DiscIO::ConvertToGCZ(original_path, dst_path.toStdString(),
+                                 file->GetPlatform() == DiscIO::Platform::WiiDisc ? 1 : 0, 16384,
+                                 &CompressCB, &progress_dialog);
+        progress_dialog.Reset();
+        return good;
+      });
+    }
+
+    progress_dialog.GetRaw()->exec();
+    if (!good.get())
+    {
+      QErrorMessage(this).showMessage(tr("Dolphin failed to complete the requested action."));
+      return;
+    }
+  }
+
+  ModalMessageBox::information(this, tr("Success"),
+                               tr("Successfully converted %n image(s).", "", m_files.size()));
+
+  close();
+}
diff --git a/Source/Core/DolphinQt/ConvertDialog.h b/Source/Core/DolphinQt/ConvertDialog.h
new file mode 100644
index 0000000000..17aeb8f3e7
--- /dev/null
+++ b/Source/Core/DolphinQt/ConvertDialog.h
@@ -0,0 +1,37 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+
+#include <QDialog>
+#include <QList>
+
+#include "DiscIO/Blob.h"
+
+class QComboBox;
+
+namespace UICommon
+{
+class GameFile;
+}
+
+class ConvertDialog final : public QDialog
+{
+  Q_OBJECT
+
+public:
+  explicit ConvertDialog(QList<std::shared_ptr<const UICommon::GameFile>> files,
+                         QWidget* parent = nullptr);
+
+private slots:
+  void Convert();
+
+private:
+  void AddToFormatComboBox(const QString& name, DiscIO::BlobType format);
+
+  QComboBox* m_format;
+  QList<std::shared_ptr<const UICommon::GameFile>> m_files;
+};
diff --git a/Source/Core/DolphinQt/DolphinQt.vcxproj b/Source/Core/DolphinQt/DolphinQt.vcxproj
index 1763c06300..3e9b862ddf 100644
--- a/Source/Core/DolphinQt/DolphinQt.vcxproj
+++ b/Source/Core/DolphinQt/DolphinQt.vcxproj
@@ -131,6 +131,7 @@
     <QtMoc Include="Config\PropertiesDialog.h" />
     <QtMoc Include="Config\SettingsWindow.h" />
     <QtMoc Include="Config\VerifyWidget.h" />
+    <QtMoc Include="ConvertDialog.h" />
     <QtMoc Include="DiscordHandler.h" />
     <QtMoc Include="DiscordJoinRequestDialog.h" />
     <QtMoc Include="FIFO\FIFOAnalyzer.h" />
@@ -211,6 +212,7 @@
     <ClCompile Include="$(QtMocOutPrefix)DualShockUDPClientWidget.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)ControllerInterfaceWindow.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)ControllersWindow.cpp" />
+    <ClCompile Include="$(QtMocOutPrefix)ConvertDialog.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)DiscordHandler.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)DiscordJoinRequestDialog.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)DoubleClickEventFilter.cpp" />
@@ -372,6 +374,7 @@
     <ClCompile Include="Config\PropertiesDialog.cpp" />
     <ClCompile Include="Config\SettingsWindow.cpp" />
     <ClCompile Include="Config\VerifyWidget.cpp" />
+    <ClCompile Include="ConvertDialog.cpp" />
     <ClCompile Include="Debugger\CodeViewWidget.cpp" />
     <ClCompile Include="Debugger\CodeWidget.cpp" />
     <ClCompile Include="Debugger\JITWidget.cpp" />
diff --git a/Source/Core/DolphinQt/GameList/GameList.cpp b/Source/Core/DolphinQt/GameList/GameList.cpp
index e4bf1c47bf..9178980106 100644
--- a/Source/Core/DolphinQt/GameList/GameList.cpp
+++ b/Source/Core/DolphinQt/GameList/GameList.cpp
@@ -6,7 +6,7 @@
 
 #include <algorithm>
 #include <cmath>
-#include <future>
+#include <utility>
 
 #include <QDesktopServices>
 #include <QDir>
@@ -40,6 +40,7 @@
 #include "DiscIO/Enums.h"
 
 #include "DolphinQt/Config/PropertiesDialog.h"
+#include "DolphinQt/ConvertDialog.h"
 #include "DolphinQt/GameList/GameListModel.h"
 #include "DolphinQt/GameList/GridProxyModel.h"
 #include "DolphinQt/GameList/ListProxyModel.h"
@@ -53,8 +54,6 @@
 
 #include "UICommon/GameFile.h"
 
-static bool CompressCB(const std::string&, float, void*);
-
 GameList::GameList(QWidget* parent) : QStackedWidget(parent)
 {
   m_model = Settings::Instance().GetGameListModel();
@@ -257,35 +256,16 @@ void GameList::ShowContextMenu(const QPoint&)
 
   if (HasMultipleSelected())
   {
-    bool wii_saves = true;
-    bool compress = false;
-    bool decompress = false;
-
-    for (const auto& game : GetSelectedGames())
+    if (std::all_of(GetSelectedGames().begin(), GetSelectedGames().end(), [](const auto& game) {
+          return DiscIO::IsDisc(game->GetPlatform()) && game->IsVolumeSizeAccurate();
+        }))
     {
-      DiscIO::Platform platform = game->GetPlatform();
-
-      if (platform == DiscIO::Platform::GameCubeDisc || platform == DiscIO::Platform::WiiDisc)
-      {
-        const auto blob_type = game->GetBlobType();
-        if (blob_type == DiscIO::BlobType::GCZ)
-          decompress = true;
-        else if (blob_type == DiscIO::BlobType::PLAIN)
-          compress = true;
-      }
-
-      if (platform != DiscIO::Platform::WiiWAD && platform != DiscIO::Platform::WiiDisc)
-        wii_saves = false;
+      menu->addAction(tr("Convert Selected Files..."), this, &GameList::ConvertFile);
+      menu->addSeparator();
     }
 
-    if (compress)
-      menu->addAction(tr("Compress Selected ISOs..."), this, [this] { CompressISO(false); });
-    if (decompress)
-      menu->addAction(tr("Decompress Selected ISOs..."), this, [this] { CompressISO(true); });
-    if (compress || decompress)
-      menu->addSeparator();
-
-    if (wii_saves)
+    if (std::all_of(GetSelectedGames().begin(), GetSelectedGames().end(),
+                    [](const auto& game) { return DiscIO::IsWii(game->GetPlatform()); }))
     {
       menu->addAction(tr("Export Wii Saves"), this, &GameList::ExportWiiSave);
       menu->addSeparator();
@@ -306,15 +286,13 @@ void GameList::ShowContextMenu(const QPoint&)
       menu->addSeparator();
     }
 
-    if (platform == DiscIO::Platform::GameCubeDisc || platform == DiscIO::Platform::WiiDisc)
+    if (DiscIO::IsDisc(platform))
     {
       menu->addAction(tr("Set as &Default ISO"), this, &GameList::SetDefaultISO);
       const auto blob_type = game->GetBlobType();
 
-      if (blob_type == DiscIO::BlobType::GCZ)
-        menu->addAction(tr("Decompress ISO..."), this, [this] { CompressISO(true); });
-      else if (blob_type == DiscIO::BlobType::PLAIN)
-        menu->addAction(tr("Compress ISO..."), this, [this] { CompressISO(false); });
+      if (game->IsVolumeSizeAccurate())
+        menu->addAction(tr("Convert File..."), this, &GameList::ConvertFile);
 
       QAction* change_disc = menu->addAction(tr("Change &Disc"), this, &GameList::ChangeDisc);
 
@@ -481,157 +459,14 @@ void GameList::OpenWiki()
   QDesktopServices::openUrl(QUrl(url));
 }
 
-void GameList::CompressISO(bool decompress)
+void GameList::ConvertFile()
 {
-  auto files = GetSelectedGames();
-  const auto game = GetSelectedGame();
-
-  if (files.empty() || !game)
+  auto games = GetSelectedGames();
+  if (games.empty())
     return;
 
-  bool wii_warning_given = false;
-  for (QMutableListIterator<std::shared_ptr<const UICommon::GameFile>> it(files); it.hasNext();)
-  {
-    auto file = it.next();
-
-    if ((file->GetPlatform() != DiscIO::Platform::GameCubeDisc &&
-         file->GetPlatform() != DiscIO::Platform::WiiDisc) ||
-        (decompress && file->GetBlobType() != DiscIO::BlobType::GCZ) ||
-        (!decompress && file->GetBlobType() != DiscIO::BlobType::PLAIN))
-    {
-      it.remove();
-      continue;
-    }
-
-    if (!wii_warning_given && !decompress && file->GetPlatform() == DiscIO::Platform::WiiDisc)
-    {
-      ModalMessageBox wii_warning(this);
-      wii_warning.setIcon(QMessageBox::Warning);
-      wii_warning.setWindowTitle(tr("Confirm"));
-      wii_warning.setText(tr("Are you sure?"));
-      wii_warning.setInformativeText(tr(
-          "Compressing a Wii disc image will irreversibly change the compressed copy by removing "
-          "padding data. Your disc image will still work. Continue?"));
-      wii_warning.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
-
-      if (wii_warning.exec() == QMessageBox::No)
-        return;
-
-      wii_warning_given = true;
-    }
-  }
-
-  QString dst_dir;
-  QString dst_path;
-
-  if (files.size() > 1)
-  {
-    dst_dir = QFileDialog::getExistingDirectory(
-        this,
-        decompress ? tr("Select where you want to save the decompressed images") :
-                     tr("Select where you want to save the compressed images"),
-        QFileInfo(QString::fromStdString(game->GetFilePath())).dir().absolutePath());
-
-    if (dst_dir.isEmpty())
-      return;
-  }
-  else
-  {
-    dst_path = QFileDialog::getSaveFileName(
-        this,
-        decompress ? tr("Select where you want to save the decompressed image") :
-                     tr("Select where you want to save the compressed image"),
-        QFileInfo(QString::fromStdString(game->GetFilePath()))
-            .dir()
-            .absoluteFilePath(
-                QFileInfo(QString::fromStdString(files[0]->GetFilePath())).completeBaseName())
-            .append(decompress ? QStringLiteral(".gcm") : QStringLiteral(".gcz")),
-        decompress ? tr("Uncompressed GC/Wii images (*.iso *.gcm)") :
-                     tr("Compressed GC/Wii images (*.gcz)"));
-
-    if (dst_path.isEmpty())
-      return;
-  }
-
-  for (const auto& file : files)
-  {
-    const auto original_path = file->GetFilePath();
-    if (files.size() > 1)
-    {
-      dst_path =
-          QDir(dst_dir)
-              .absoluteFilePath(QFileInfo(QString::fromStdString(original_path)).completeBaseName())
-              .append(decompress ? QStringLiteral(".gcm") : QStringLiteral(".gcz"));
-      QFileInfo dst_info = QFileInfo(dst_path);
-      if (dst_info.exists())
-      {
-        ModalMessageBox confirm_replace(this);
-        confirm_replace.setIcon(QMessageBox::Warning);
-        confirm_replace.setWindowTitle(tr("Confirm"));
-        confirm_replace.setText(tr("The file %1 already exists.\n"
-                                   "Do you wish to replace it?")
-                                    .arg(dst_info.fileName()));
-        confirm_replace.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
-
-        if (confirm_replace.exec() == QMessageBox::No)
-          continue;
-      }
-    }
-
-    ParallelProgressDialog progress_dialog(
-        decompress ? tr("Decompressing...") : tr("Compressing..."), tr("Abort"), 0, 100, this);
-    progress_dialog.GetRaw()->setWindowModality(Qt::WindowModal);
-    progress_dialog.GetRaw()->setWindowTitle(tr("Progress"));
-
-    std::future<bool> good;
-
-    if (decompress)
-    {
-      if (files.size() > 1)
-      {
-        progress_dialog.GetRaw()->setLabelText(
-            tr("Decompressing...") + QLatin1Char{'\n'} +
-            QFileInfo(QString::fromStdString(original_path)).fileName());
-      }
-
-      good = std::async(std::launch::async, [&] {
-        const bool good = DiscIO::ConvertToPlain(original_path, dst_path.toStdString(), &CompressCB,
-                                                 &progress_dialog);
-        progress_dialog.Reset();
-        return good;
-      });
-    }
-    else
-    {
-      if (files.size() > 1)
-      {
-        progress_dialog.GetRaw()->setLabelText(
-            tr("Compressing...") + QLatin1Char{'\n'} +
-            QFileInfo(QString::fromStdString(original_path)).fileName());
-      }
-
-      good = std::async(std::launch::async, [&] {
-        const bool good =
-            DiscIO::ConvertToGCZ(original_path, dst_path.toStdString(),
-                                 file->GetPlatform() == DiscIO::Platform::WiiDisc ? 1 : 0, 16384,
-                                 &CompressCB, &progress_dialog);
-        progress_dialog.Reset();
-        return good;
-      });
-    }
-
-    progress_dialog.GetRaw()->exec();
-    if (!good.get())
-    {
-      QErrorMessage(this).showMessage(tr("Dolphin failed to complete the requested action."));
-      return;
-    }
-  }
-
-  ModalMessageBox::information(this, tr("Success"),
-                               decompress ?
-                                   tr("Successfully decompressed %n image(s).", "", files.size()) :
-                                   tr("Successfully compressed %n image(s).", "", files.size()));
+  ConvertDialog dialog{std::move(games), this};
+  dialog.exec();
 }
 
 void GameList::InstallWAD()
@@ -949,17 +784,6 @@ void GameList::OnGameListVisibilityChanged()
   m_grid_proxy->invalidate();
 }
 
-static bool CompressCB(const std::string& text, float percent, void* ptr)
-{
-  if (ptr == nullptr)
-    return false;
-
-  auto* progress_dialog = static_cast<ParallelProgressDialog*>(ptr);
-
-  progress_dialog->SetValue(percent * 100);
-  return !progress_dialog->WasCanceled();
-}
-
 void GameList::OnSectionResized(int index, int, int)
 {
   auto* hor_header = m_list->horizontalHeader();
diff --git a/Source/Core/DolphinQt/GameList/GameList.h b/Source/Core/DolphinQt/GameList/GameList.h
index 596c92f57e..6587653ee4 100644
--- a/Source/Core/DolphinQt/GameList/GameList.h
+++ b/Source/Core/DolphinQt/GameList/GameList.h
@@ -64,7 +64,7 @@ private:
   void InstallWAD();
   void UninstallWAD();
   void ExportWiiSave();
-  void CompressISO(bool decompress);
+  void ConvertFile();
   void ChangeDisc();
   void NewTag();
   void DeleteTag();
diff --git a/Source/Core/UICommon/GameFile.cpp b/Source/Core/UICommon/GameFile.cpp
index cc64d9d3e9..139dcce688 100644
--- a/Source/Core/UICommon/GameFile.cpp
+++ b/Source/Core/UICommon/GameFile.cpp
@@ -116,6 +116,7 @@ GameFile::GameFile(std::string path) : m_file_path(std::move(path))
       m_blob_type = volume->GetBlobType();
       m_file_size = volume->GetRawSize();
       m_volume_size = volume->GetSize();
+      m_volume_size_is_accurate = volume->IsSizeAccurate();
 
       m_internal_name = volume->GetInternalName();
       m_game_id = volume->GetGameID();
@@ -136,6 +137,7 @@ GameFile::GameFile(std::string path) : m_file_path(std::move(path))
   {
     m_valid = true;
     m_file_size = m_volume_size = File::GetSize(m_file_path);
+    m_volume_size_is_accurate = true;
     m_platform = DiscIO::Platform::ELFOrDOL;
     m_blob_type = DiscIO::BlobType::DIRECTORY;
   }
@@ -296,6 +298,7 @@ void GameFile::DoState(PointerWrap& p)
 
   p.Do(m_file_size);
   p.Do(m_volume_size);
+  p.Do(m_volume_size_is_accurate);
 
   p.Do(m_short_names);
   p.Do(m_long_names);
diff --git a/Source/Core/UICommon/GameFile.h b/Source/Core/UICommon/GameFile.h
index 87513118a9..53401e8756 100644
--- a/Source/Core/UICommon/GameFile.h
+++ b/Source/Core/UICommon/GameFile.h
@@ -89,6 +89,7 @@ public:
   const std::string& GetApploaderDate() const { return m_apploader_date; }
   u64 GetFileSize() const { return m_file_size; }
   u64 GetVolumeSize() const { return m_volume_size; }
+  bool IsVolumeSizeAccurate() const { return m_volume_size_is_accurate; }
   const GameBanner& GetBannerImage() const;
   const GameCover& GetCoverImage() const;
   void DoState(PointerWrap& p);
@@ -124,6 +125,7 @@ private:
 
   u64 m_file_size{};
   u64 m_volume_size{};
+  bool m_volume_size_is_accurate{};
 
   std::map<DiscIO::Language, std::string> m_short_names;
   std::map<DiscIO::Language, std::string> m_long_names;
diff --git a/Source/Core/UICommon/GameFileCache.cpp b/Source/Core/UICommon/GameFileCache.cpp
index 07cbf726c4..9b2729407e 100644
--- a/Source/Core/UICommon/GameFileCache.cpp
+++ b/Source/Core/UICommon/GameFileCache.cpp
@@ -27,7 +27,7 @@
 
 namespace UICommon
 {
-static constexpr u32 CACHE_REVISION = 16;  // Last changed in PR 8313
+static constexpr u32 CACHE_REVISION = 17;  // Last changed in PR 8738
 
 std::vector<std::string> FindAllGamePaths(const std::vector<std::string>& directories_to_scan,
                                           bool recursive_scan)