diff --git a/arm9/source/patches/arm7/CardiTaskThreadPatchAsm.h b/arm9/source/patches/arm7/CardiTaskThreadPatchAsm.h
index 21df462..29ac1b7 100644
--- a/arm9/source/patches/arm7/CardiTaskThreadPatchAsm.h
+++ b/arm9/source/patches/arm7/CardiTaskThreadPatchAsm.h
@@ -13,3 +13,4 @@ extern u32 __patch_carditaskthread_failoffset;
 extern u32 __patch_carditaskthread_successoffset;
 extern u32 __patch_carditaskthread_readsave_asm_address;
 extern u32 __patch_carditaskthread_writesave_asm_address;
+extern u32 __patch_carditaskthread_verifysave_asm_address;
diff --git a/arm9/source/patches/arm7/CardiTaskThreadPatchAsm.s b/arm9/source/patches/arm7/CardiTaskThreadPatchAsm.s
index 0778869..22de3ba 100644
--- a/arm9/source/patches/arm7/CardiTaskThreadPatchAsm.s
+++ b/arm9/source/patches/arm7/CardiTaskThreadPatchAsm.s
@@ -93,8 +93,17 @@ write_backup:
 
 verify_backup:
     ldr r0, [r4]
-    movs r1, #0
-    str r1, [r0] // result
+    ldr r2, [r0, #0xC] // src
+    ldr r1, [r0, #0x10] // dst
+    ldr r3, [r0, #0x14] // len
+    cmp r3, #0
+        beq end_success
+
+    push {r0}
+    ldr r0, __patch_carditaskthread_verifysave_asm_address
+    bl blx_r0
+    pop {r1}
+    str r0, [r1] // result
     b end_success
 
 blx_r0:
@@ -118,6 +127,10 @@ __patch_carditaskthread_readsave_asm_address:
 __patch_carditaskthread_writesave_asm_address:
     .word 0
 
+.global __patch_carditaskthread_verifysave_asm_address
+__patch_carditaskthread_verifysave_asm_address:
+    .word 0
+
 .pool
 
 .end
\ No newline at end of file
diff --git a/arm9/source/patches/arm7/VerifySaveAsm.h b/arm9/source/patches/arm7/VerifySaveAsm.h
new file mode 100644
index 0000000..9d1e06f
--- /dev/null
+++ b/arm9/source/patches/arm7/VerifySaveAsm.h
@@ -0,0 +1,31 @@
+#pragma once
+#include "sections.h"
+#include "../PatchCode.h"
+#include "../SectorRemapPatchCode.h"
+#include "../platform/SdReadPatchCode.h"
+
+DEFINE_SECTION_SYMBOLS(verifysave);
+
+extern "C" void verifysave_asm(u32, u32 saveSrc, void* memoryDst, u32 byteLength);
+
+extern u32 verifysave_tmpBufferPtr;
+extern u32 verifysave_save_offset_to_sd_sector_asm_address;
+extern u32 verifysave_sdread_asm_address;
+
+class VerifySavePatchCode : public PatchCode
+{
+public:
+    VerifySavePatchCode(PatchHeap& patchHeap, const SectorRemapPatchCode* sectorRemapPatchCode,
+        const SdReadPatchCode* sdReadPatchCode, void* tmpBuffer)
+        : PatchCode(SECTION_START(verifysave), SECTION_SIZE(verifysave), patchHeap)
+    {
+        verifysave_save_offset_to_sd_sector_asm_address = (u32)sectorRemapPatchCode->GetRemapFunction();
+        verifysave_sdread_asm_address = (u32)sdReadPatchCode->GetSdReadFunction();
+        verifysave_tmpBufferPtr = (u32)tmpBuffer;
+    }
+
+    const void* GetVerifySaveFunction() const
+    {
+        return GetAddressAtTarget((void*)verifysave_asm);
+    }
+};
diff --git a/arm9/source/patches/arm7/VerifySaveAsm.s b/arm9/source/patches/arm7/VerifySaveAsm.s
new file mode 100644
index 0000000..6f01f54
--- /dev/null
+++ b/arm9/source/patches/arm7/VerifySaveAsm.s
@@ -0,0 +1,83 @@
+.cpu arm7tdmi
+.section "verifysave", "ax"
+.syntax unified
+.thumb
+
+// r1 = save src
+// r2 = memory src
+// r3 = byte length
+.global verifysave_asm
+.type verifysave_asm, %function
+verifysave_asm:
+    push {r4,r5,r6,r7,lr}
+    movs r4, r3 // remaining bytes
+    movs r5, r1
+    movs r6, r2
+1:
+    movs r0, r5 // will be rounded down by function
+    ldr r3, verifysave_save_offset_to_sd_sector_asm_address
+    bl blx_r3
+    cmp r0, #0
+    beq end // out of bounds
+
+    ldr r1, verifysave_tmpBufferPtr
+    movs r2, #1 // single sector
+    lsls r7, r2, #9 // 512
+    ldr r3, verifysave_sdread_asm_address
+    bl blx_r3
+
+    // verify bytes
+    lsls r2, r5, #23
+    lsrs r2, r2, #23 // r2 = byte offset in sector
+    subs r0, r6, r2
+    subs r7, r7, r2 // remaining in sector
+    cmp r7, r4 // if remaining in sector > requested read length
+    bls 2f
+    movs r7, r4 // clamp to requested read length
+2:
+    subs r4, r7
+    adds r5, r7
+    adds r6, r7
+    ldr r1, verifysave_tmpBufferPtr
+
+3:
+    ldrb r3, [r1, r2]
+    mov lr, r3
+    ldrb r3, [r0, r2]
+    cmp lr, r3
+    bne bad_end
+    adds r2, #1
+    subs r7, #1
+    bne 3b
+
+    cmp r4, #0
+    bne 1b
+
+end:
+    movs r0, #0
+    pop {r4,r5,r6,r7,pc}
+
+bad_end:
+    movs r0, #1
+    pop {r4,r5,r6,r7,pc}
+
+blx_r3:
+    bx r3
+
+.balign 4
+
+.global verifysave_tmpBufferPtr
+verifysave_tmpBufferPtr:
+    .word 0
+
+.global verifysave_save_offset_to_sd_sector_asm_address
+verifysave_save_offset_to_sd_sector_asm_address:
+    .word 0
+
+.global verifysave_sdread_asm_address
+verifysave_sdread_asm_address:
+    .word 0
+
+.pool
+
+.end
\ No newline at end of file
diff --git a/arm9/source/patches/arm7/sdk2to4/CardiTaskThreadPatch.cpp b/arm9/source/patches/arm7/sdk2to4/CardiTaskThreadPatch.cpp
index deb42eb..676a3a2 100644
--- a/arm9/source/patches/arm7/sdk2to4/CardiTaskThreadPatch.cpp
+++ b/arm9/source/patches/arm7/sdk2to4/CardiTaskThreadPatch.cpp
@@ -5,6 +5,7 @@
 #include "patches/PatchContext.h"
 #include "patches/arm7/ReadSaveAsm.h"
 #include "patches/arm7/WriteSaveAsm.h"
+#include "patches/arm7/VerifySaveAsm.h"
 #include "patches/FunctionSignature.h"
 #include "patches/platform/LoaderPlatform.h"
 #include "patches/arm7/SaveOffsetToSdSectorAsm.h"
@@ -131,9 +132,16 @@ void CardiTaskThreadPatch::ApplyPatch(PatchContext& patchContext)
         writePatchCode,
         tmpBuffer
     );
+    auto verifySavePatchCode = patchContext.GetPatchCodeCollection().AddUniquePatchCode<VerifySavePatchCode>(
+        patchContext.GetPatchHeap(),
+        sectorRemapPatchCode,
+        readPatchCode,
+        tmpBuffer
+    );
 
     __patch_carditaskthread_readsave_asm_address = (u32)readSavePatchCode->GetReadSaveFunction();
     __patch_carditaskthread_writesave_asm_address = (u32)writeSavePatchCode->GetWriteSaveFunction();
+    __patch_carditaskthread_verifysave_asm_address = (u32)verifySavePatchCode->GetVerifySaveFunction();
 
     u32 entryAddress;
     u32 patchOffset;
diff --git a/arm9/source/patches/arm7/sdk5/CardiDoTaskFromArm9Patch.cpp b/arm9/source/patches/arm7/sdk5/CardiDoTaskFromArm9Patch.cpp
index 1bb557e..7f32292 100644
--- a/arm9/source/patches/arm7/sdk5/CardiDoTaskFromArm9Patch.cpp
+++ b/arm9/source/patches/arm7/sdk5/CardiDoTaskFromArm9Patch.cpp
@@ -4,6 +4,7 @@
 #include "fileInfo.h"
 #include "patches/arm7/ReadSaveAsm.h"
 #include "patches/arm7/WriteSaveAsm.h"
+#include "patches/arm7/VerifySaveAsm.h"
 #include "patches/arm7/SaveOffsetToSdSectorAsm.h"
 #include "patches/platform/LoaderPlatform.h"
 #include "patches/OffsetToSectorRemapAsm.h"
@@ -82,9 +83,16 @@ void CardiDoTaskFromArm9Patch::ApplyPatch(PatchContext& patchContext)
         writePatchCode,
         tmpBuffer
     );
+    auto verifySavePatchCode = patchContext.GetPatchCodeCollection().AddUniquePatchCode<VerifySavePatchCode>(
+        patchContext.GetPatchHeap(),
+        sectorRemapPatchCode,
+        readPatchCode,
+        tmpBuffer
+    );
 
     __patch_carditaskthread_readsave_asm_address = (u32)readSavePatchCode->GetReadSaveFunction();
     __patch_carditaskthread_writesave_asm_address = (u32)writeSavePatchCode->GetWriteSaveFunction();
+    __patch_carditaskthread_verifysave_asm_address = (u32)verifySavePatchCode->GetVerifySaveFunction();
 
     u32 patchOffset;