diff --git a/eive_tmtc/pus_tm/event_handler.py b/eive_tmtc/pus_tm/event_handler.py
index 77c8a1e..d90d3c2 100644
--- a/eive_tmtc/pus_tm/event_handler.py
+++ b/eive_tmtc/pus_tm/event_handler.py
@@ -7,6 +7,7 @@ from eive_tmtc.config.object_ids import get_object_ids
 from eive_tmtc.pus_tm.defs import PrintWrapper
 from eive_tmtc.pus_tm.verification_handler import generic_retval_printout
 from eive_tmtc.tmtc.acs.subsystem import AcsMode
+from eive_tmtc.tmtc.core import SdState, SdCardSelect
 from tmtccmd.tc.pus_200_fsfw_mode import Mode
 from tmtccmd.tc.pus_201_fsfw_health import FsfwHealth
 
@@ -127,12 +128,19 @@ def handle_event_packet(  # noqa C901: Complexity okay here
         time_dt = datetime.datetime.fromtimestamp(time, datetime.timezone.utc)
         pw.dlog(f"Current time: {time_dt}")
     if info.name == "ACTIVE_SD_INFO":
-        active_sd = event_def.param1
         sd_0_state = (event_def.param2 >> 16) & 0xFFFF
         sd_1_state = event_def.param2 & 0xFFFF
-        pw.dlog(
-            f"Active SD card {active_sd} | SD 0 State {sd_0_state} | SD 1 State {sd_1_state}"
-        )
+        active_sd = event_def.param1
+        try:
+            active_sd = SdCardSelect(event_def.param1)
+            sd_0_state = SdState((event_def.param2 >> 16) & 0xFFFF)
+            sd_1_state = SdState(event_def.param2 & 0xFFFF)
+        except IndexError:
+            _LOGGER.error(f"Received invalid event fields for event {event_def}")
+        finally:
+            pw.dlog(
+                f"Active SD card {active_sd!r} | SD 0 State {sd_0_state!r} | SD 1 State {sd_1_state!r}"
+            )
     if info.name == "HEALTH_INFO":
         specific_handler = True
         health = FsfwHealth(event_def.param1)
diff --git a/eive_tmtc/tmtc/core.py b/eive_tmtc/tmtc/core.py
index f8869fa..6a85ce2 100644
--- a/eive_tmtc/tmtc/core.py
+++ b/eive_tmtc/tmtc/core.py
@@ -24,6 +24,19 @@ from tmtccmd.fsfw.tmtc_printer import FsfwTmTcPrinter
 _LOGGER = logging.getLogger(__name__)
 
 
+class SdState(enum.IntEnum):
+    OFF = 0
+    ON = 1
+    MOUNTED = 2
+
+
+class SdCardSelect(enum.IntEnum):
+    SD_0 = 0
+    SD_1 = 1
+    BOTH = 2
+    NONE = 3
+
+
 class ActionId(enum.IntEnum):
     ANNOUNCE_VERSION = 1
     ANNOUNCE_CURRENT_IMAGE = 2