diff --git a/Analyser/Static/StaticAnalyser.cpp b/Analyser/Static/StaticAnalyser.cpp
index 35e11e5ce..ad80cd8fb 100644
--- a/Analyser/Static/StaticAnalyser.cpp
+++ b/Analyser/Static/StaticAnalyser.cpp
@@ -98,6 +98,7 @@ static Media GetMediaAndPlatforms(const std::string &file_name, TargetPlatform::
 	Format("81", result.tapes, Tape::ZX80O81P, TargetPlatform::ZX8081)											// 81
 	Format("a26", result.cartridges, Cartridge::BinaryDump, TargetPlatform::Atari2600)							// A26
 	Format("adf", result.disks, Disk::DiskImageHolder<Storage::Disk::AcornADF>, TargetPlatform::Acorn)			// ADF
+	Format("adl", result.disks, Disk::DiskImageHolder<Storage::Disk::AcornADF>, TargetPlatform::Acorn)			// ADL
 	Format("bin", result.cartridges, Cartridge::BinaryDump, TargetPlatform::AllCartridge)						// BIN (cartridge dump)
 	Format("cas", result.tapes, Tape::CAS, TargetPlatform::MSX)													// CAS
 	Format("cdt", result.tapes, Tape::TZX, TargetPlatform::AmstradCPC)											// CDT
diff --git a/Storage/Disk/DiskImage/Formats/AcornADF.cpp b/Storage/Disk/DiskImage/Formats/AcornADF.cpp
index 7fc657273..e5b78e686 100644
--- a/Storage/Disk/DiskImage/Formats/AcornADF.cpp
+++ b/Storage/Disk/DiskImage/Formats/AcornADF.cpp
@@ -18,12 +18,13 @@ namespace {
 using namespace Storage::Disk;
 
 AcornADF::AcornADF(const std::string &file_name) : MFMSectorDump(file_name) {
-	// very loose validation: the file needs to be a multiple of 256 bytes
-	// and not ungainly large
+	// Check that the disk image contains a whole number of sector.
 	if(file_.stats().st_size % off_t(128 << sector_size)) throw Error::InvalidFormat;
+
+	// Check that the disk image is at least large enough to hold an ADFS catalogue.
 	if(file_.stats().st_size < 7 * off_t(128 << sector_size)) throw Error::InvalidFormat;
 
-	// check that the initial directory's 'Hugo's are present
+	// Check that the initial directory's 'Hugo's are present.
 	file_.seek(513, SEEK_SET);
 	uint8_t bytes[4];
 	file_.read(bytes, 4);
@@ -33,6 +34,10 @@ AcornADF::AcornADF(const std::string &file_name) : MFMSectorDump(file_name) {
 	file_.read(bytes, 4);
 	if(bytes[0] != 'H' || bytes[1] != 'u' || bytes[2] != 'g' || bytes[3] != 'o') throw Error::InvalidFormat;
 
+	// Pick a number of heads; treat this image as double sided if it's too large to be single-sided.
+	head_count_ = 1 + (file_.stats().st_size > sectors_per_track * off_t(128 << sector_size) * 80);
+
+	// Announce disk geometry.
 	set_geometry(sectors_per_track, sector_size, 0, true);
 }
 
@@ -41,9 +46,9 @@ HeadPosition AcornADF::get_maximum_head_position() {
 }
 
 int AcornADF::get_head_count() {
-	return 1;
+	return head_count_;
 }
 
 long AcornADF::get_file_offset_for_position(Track::Address address) {
-	return address.position.as_int() * (128 << sector_size) * sectors_per_track;
+	return (address.position.as_int() * head_count_ + address.head) * (128 << sector_size) * sectors_per_track;
 }
diff --git a/Storage/Disk/DiskImage/Formats/AcornADF.hpp b/Storage/Disk/DiskImage/Formats/AcornADF.hpp
index c0d040d56..1988579f1 100644
--- a/Storage/Disk/DiskImage/Formats/AcornADF.hpp
+++ b/Storage/Disk/DiskImage/Formats/AcornADF.hpp
@@ -34,6 +34,7 @@ class AcornADF: public MFMSectorDump {
 
 	private:
 		long get_file_offset_for_position(Track::Address address) final;
+		int head_count_ = 1;
 };
 
 }