diff --git a/Source/Core/DiscIO/Src/Blob.h b/Source/Core/DiscIO/Src/Blob.h
index 6e8c80b1f7..556ba23402 100644
--- a/Source/Core/DiscIO/Src/Blob.h
+++ b/Source/Core/DiscIO/Src/Blob.h
@@ -40,6 +40,7 @@ public:
 
 	virtual u64 GetRawSize() const  = 0;
 	virtual u64 GetDataSize() const = 0;
+	// NOT thread-safe - can't call this from multiple threads.
 	virtual bool Read(u64 offset, u64 size, u8* out_ptr) = 0;
 
 protected:
diff --git a/Source/Core/DiscIO/Src/CompressedBlob.cpp b/Source/Core/DiscIO/Src/CompressedBlob.cpp
index 05973e8ab3..dcaa9da2b6 100644
--- a/Source/Core/DiscIO/Src/CompressedBlob.cpp
+++ b/Source/Core/DiscIO/Src/CompressedBlob.cpp
@@ -37,6 +37,7 @@ namespace DiscIO
 
 CompressedBlobReader::CompressedBlobReader(const char *filename)
 {
+	file_name = filename;
 	file = fopen(filename, "rb");
 	fseek(file, 0, SEEK_END);
 	file_size = ftell(file);
@@ -118,8 +119,10 @@ void CompressedBlobReader::GetBlock(u64 block_num, u8 *out_ptr)
 	// First, check hash.
 	u32 block_hash = HashAdler32(source, comp_block_size);
 	if (block_hash != hashes[block_num])
-		PanicAlert("Hash of block %i is %08x instead of %08x. Your ISO is corrupt.",
-		           block_num, block_hash, hashes[block_num]);
+		PanicAlert("Hash of block %i is %08x instead of %08x.\n"
+		           "Your ISO, %s, is corrupt.",
+		           block_num, block_hash, hashes[block_num],
+				   file_name.c_str());
 
 	if (uncompressed)
 	{
diff --git a/Source/Core/DiscIO/Src/CompressedBlob.h b/Source/Core/DiscIO/Src/CompressedBlob.h
index 1a63551043..cd96393039 100644
--- a/Source/Core/DiscIO/Src/CompressedBlob.h
+++ b/Source/Core/DiscIO/Src/CompressedBlob.h
@@ -29,6 +29,8 @@
 #define COMPRESSED_BLOB_H_
 
 #include <stdio.h>
+#include <string>
+
 #include "Blob.h"
 
 namespace DiscIO
@@ -56,18 +58,6 @@ struct CompressedBlobHeader // 32 bytes
 
 class CompressedBlobReader : public SectorReader
 {
-private:
-	CompressedBlobHeader header;
-	u64 *block_pointers;
-	u32 *hashes;
-	int data_offset;
-	FILE *file;
-	u64 file_size;
-	u8 *zlib_buffer;
-	int zlib_buffer_size;
-
-	CompressedBlobReader(const char *filename);
-
 public:
 	static CompressedBlobReader* Create(const char *filename);
 	~CompressedBlobReader();
@@ -76,6 +66,18 @@ public:
 	u64 GetRawSize() const { return file_size; }
 	u64 GetBlockCompressedSize(u64 block_num) const;
 	void GetBlock(u64 block_num, u8 *out_ptr);
+private:
+	CompressedBlobReader(const char *filename);
+
+	CompressedBlobHeader header;
+	u64 *block_pointers;
+	u32 *hashes;
+	int data_offset;
+	FILE *file;
+	u64 file_size;
+	u8 *zlib_buffer;
+	int zlib_buffer_size;
+	std::string file_name;
 };
 
 }  // namespace