diff --git a/Analyser/Static/AmstradCPC/StaticAnalyser.cpp b/Analyser/Static/AmstradCPC/StaticAnalyser.cpp
index 419e855dc..49b002890 100644
--- a/Analyser/Static/AmstradCPC/StaticAnalyser.cpp
+++ b/Analyser/Static/AmstradCPC/StaticAnalyser.cpp
@@ -232,9 +232,9 @@ Analyser::Static::TargetList Analyser::Static::AmstradCPC::GetTargets(const Medi
 		const auto system_format = Storage::Disk::CPM::ParameterBlock::cpc_system_format();
 
 		for(auto &disk: media.disks) {
-			// Check for an ordinary catalogue.
+			// Check for an ordinary catalogue, making sure this isn't actually a ZX Spectrum disk.
 			std::unique_ptr<Storage::Disk::CPM::Catalogue> data_catalogue = Storage::Disk::CPM::GetCatalogue(disk, data_format);
-			if(data_catalogue) {
+			if(data_catalogue && !data_catalogue->is_zx_spectrum_booter()) {
 				InspectCatalogue(*data_catalogue, target);
 				target->media.disks.push_back(disk);
 				continue;
@@ -248,7 +248,7 @@ Analyser::Static::TargetList Analyser::Static::AmstradCPC::GetTargets(const Medi
 
 			// Failing that check for a system catalogue.
 			std::unique_ptr<Storage::Disk::CPM::Catalogue> system_catalogue = Storage::Disk::CPM::GetCatalogue(disk, system_format);
-			if(system_catalogue) {
+			if(system_catalogue && !system_catalogue->is_zx_spectrum_booter()) {
 				InspectCatalogue(*system_catalogue, target);
 				target->media.disks.push_back(disk);
 				continue;
diff --git a/Analyser/Static/ZXSpectrum/StaticAnalyser.cpp b/Analyser/Static/ZXSpectrum/StaticAnalyser.cpp
index 1a60b5ae8..d47e8d4c0 100644
--- a/Analyser/Static/ZXSpectrum/StaticAnalyser.cpp
+++ b/Analyser/Static/ZXSpectrum/StaticAnalyser.cpp
@@ -98,12 +98,7 @@ bool IsSpectrumDisk(const std::shared_ptr<Storage::Disk::Disk> &disk) {
 
 	// ... otherwise read a CPM directory and look for a BASIC program called "DISK".
 	const auto catalogue = Storage::Disk::CPM::GetCatalogue(disk, cpm_format);
-	if(!catalogue) return false;
-	const auto file = std::find_if(catalogue->files.begin(), catalogue->files.end(), [](const auto &file) { return file.name == "DISK    "; });
-	if(file == catalogue->files.end()) return false;
-
-	// TODO: check out contents of "DISK"
-	return true;
+	return catalogue && catalogue->is_zx_spectrum_booter();
 }
 
 }
diff --git a/Storage/Disk/Parsers/CPM.cpp b/Storage/Disk/Parsers/CPM.cpp
index b6a757091..93e3efa9a 100644
--- a/Storage/Disk/Parsers/CPM.cpp
+++ b/Storage/Disk/Parsers/CPM.cpp
@@ -158,3 +158,13 @@ std::unique_ptr<Storage::Disk::CPM::Catalogue> Storage::Disk::CPM::GetCatalogue(
 
 	return result;
 }
+
+bool Catalogue::is_zx_spectrum_booter() {
+	// Check for a file called 'DISK'.
+	const auto file = std::find_if(files.begin(), files.end(), [](const auto &file) { return file.name == "DISK    "; });
+	if(file == files.end()) return false;
+
+	// TODO: check the file is valid ZX Spectrum BASIC.
+
+	return true;
+}
diff --git a/Storage/Disk/Parsers/CPM.hpp b/Storage/Disk/Parsers/CPM.hpp
index 847a5ab24..02958e822 100644
--- a/Storage/Disk/Parsers/CPM.hpp
+++ b/Storage/Disk/Parsers/CPM.hpp
@@ -60,6 +60,8 @@ struct File {
 
 struct Catalogue {
 	std::vector<File> files;
+
+	bool is_zx_spectrum_booter();
 };
 
 std::unique_ptr<Catalogue> GetCatalogue(const std::shared_ptr<Storage::Disk::Disk> &disk, const ParameterBlock &parameters);