diff --git a/core/embed/extmod/modtrezorio/modtrezorio-sdcard.h b/core/embed/extmod/modtrezorio/modtrezorio-sdcard.h
index c4c915699..d3564e02c 100644
--- a/core/embed/extmod/modtrezorio/modtrezorio-sdcard.h
+++ b/core/embed/extmod/modtrezorio/modtrezorio-sdcard.h
@@ -17,9 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "sdcard.h"
-
 #include "embed/extmod/trezorobj.h"
+#include "py/mperrno.h"
+
+#include "sdcard.h"
 
 /// class SDCard:
 ///     """
@@ -79,7 +80,7 @@ STATIC mp_obj_t mod_trezorio_SDCard_capacity(mp_obj_t self) {
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorio_SDCard_capacity_obj,
                                  mod_trezorio_SDCard_capacity);
 
-/// def read(self, block_num: int, buf: bytearray) -> bool:
+/// def read(self, block_num: int, buf: bytearray) -> None:
 ///     """
 ///     Reads blocks starting with block_num from the SD card into buf.
 ///     Number of bytes read is length of buf rounded down to multiply of
@@ -90,13 +91,15 @@ STATIC mp_obj_t mod_trezorio_SDCard_read(mp_obj_t self, mp_obj_t block_num,
   uint32_t block = trezor_obj_get_uint(block_num);
   mp_buffer_info_t bufinfo;
   mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_WRITE);
-  return mp_obj_new_bool(
-      sdcard_read_blocks(bufinfo.buf, block, bufinfo.len / SDCARD_BLOCK_SIZE));
+  if (sectrue != sdcard_read_blocks(bufinfo.buf, block, bufinfo.len / SDCARD_BLOCK_SIZE)) {
+    mp_raise_OSError(MP_EIO);
+  }
+  return mp_const_none;
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_trezorio_SDCard_read_obj,
                                  mod_trezorio_SDCard_read);
 
-/// def write(self, block_num: int, buf: bytes) -> bool:
+/// def write(self, block_num: int, buf: bytes) -> None:
 ///     """
 ///     Writes blocks starting with block_num from buf to the SD card.
 ///     Number of bytes written is length of buf rounded down to multiply of
@@ -107,8 +110,10 @@ STATIC mp_obj_t mod_trezorio_SDCard_write(mp_obj_t self, mp_obj_t block_num,
   uint32_t block = trezor_obj_get_uint(block_num);
   mp_buffer_info_t bufinfo;
   mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ);
-  return mp_obj_new_bool(
-      sdcard_write_blocks(bufinfo.buf, block, bufinfo.len / SDCARD_BLOCK_SIZE));
+  if (sectrue != sdcard_write_blocks(bufinfo.buf, block, bufinfo.len / SDCARD_BLOCK_SIZE)) {
+    mp_raise_OSError(MP_EIO);
+  }
+  return mp_const_none;
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_trezorio_SDCard_write_obj,
                                  mod_trezorio_SDCard_write);
diff --git a/core/tests/production_tests/main.py b/core/tests/production_tests/main.py
index 60d358530..99bbf4267 100644
--- a/core/tests/production_tests/main.py
+++ b/core/tests/production_tests/main.py
@@ -93,10 +93,25 @@ def test_sd():
     if sd.present():
         sd.power(True)
         buf1 = bytearray(8 * 1024)
-        sd.read(0, buf1)
-        sd.write(0, buf1)
+        try:
+            sd.read(0, buf1)
+        except OSError:
+            print('ERROR READING DATA')
+            sd.power(False)
+            return
+        try:
+            sd.write(0, buf1)
+        except OSError:
+            print('ERROR WRITING DATA')
+            sd.power(False)
+            return
         buf2 = bytearray(8 * 1024)
-        sd.read(0, buf2)
+        try:
+            sd.read(0, buf2)
+        except OSError:
+            print('ERROR READING DATA')
+            sd.power(False)
+            return
         if buf1 == buf2:
             print('OK')
         else:
diff --git a/core/tests/test_trezor.io.sdcard.py b/core/tests/test_trezor.io.sdcard.py
index c713f35dd..b108d5b14 100644
--- a/core/tests/test_trezor.io.sdcard.py
+++ b/core/tests/test_trezor.io.sdcard.py
@@ -13,21 +13,24 @@ class TestTrezorIoSdcard(unittest.TestCase):
         sd = io.SDCard()
         x = bytearray(8 * 512)
         self.assertEqual(sd.capacity(), 0)
-        self.assertFalse(sd.read(0, x))
+        with self.assertRaises(OSError):
+            sd.read(0, x)
         sd.power(True)
         self.assertTrue(sd.capacity() > 0)
-        self.assertTrue(sd.read(0, x))
+        sd.read(0, x)
         sd.power(False)
         self.assertEqual(sd.capacity(), 0)
-        self.assertFalse(sd.read(0, x))
+        with self.assertRaises(OSError):
+            sd.read(0, x)
 
     def test_read(self):
         sd = io.SDCard()
         x = bytearray(8 * 512)
         sd.power(True)
-        self.assertTrue(sd.read(0, x))
+        sd.read(0, x)
         sd.power(False)
-        self.assertFalse(sd.read(0, x))
+        with self.assertRaises(OSError):
+            sd.read(0, x)
 
     def test_read_write(self):
         sd = io.SDCard()
@@ -35,11 +38,11 @@ class TestTrezorIoSdcard(unittest.TestCase):
         w0 = bytearray(b'0' * (8 * 512))
         w1 = bytearray(b'1' * (8 * 512))
         sd.power(True)
-        self.assertTrue(sd.write(0, w0))
-        self.assertTrue(sd.read(0, r))
+        sd.write(0, w0)
+        sd.read(0, r)
         self.assertEqual(r, w0)
-        self.assertTrue(sd.write(0, w1))
-        self.assertTrue(sd.read(0, r))
+        sd.write(0, w1)
+        sd.read(0, r)
         self.assertEqual(r, w1)
         sd.power(False)