diff --git a/scos_actions/actions/acquire_sea_data_product.py b/scos_actions/actions/acquire_sea_data_product.py
index 4c5a3355..caeb5688 100644
--- a/scos_actions/actions/acquire_sea_data_product.py
+++ b/scos_actions/actions/acquire_sea_data_product.py
@@ -74,7 +74,11 @@
     create_statistical_detector,
 )
 from scos_actions.signals import measurement_action_completed, trigger_api_restart
-from scos_actions.utils import convert_datetime_to_millisecond_iso_format, get_days_up
+from scos_actions.utils import (
+    convert_datetime_to_millisecond_iso_format,
+    get_days_up,
+    get_disk_usage,
+)
 
 env = Env()
 logger = logging.getLogger(__name__)
@@ -785,6 +789,11 @@ def capture_diagnostics(
             cpu_diag["ssd_smart_data"] = ntia_diagnostics.SsdSmartData(**smart_data)
         except:
             logger.warning("Failed to get SSD SMART data")
+        try:  # Disk usage
+            disk_usage = get_disk_usage()
+            cpu_diag["disk_usage"] = disk_usage
+        except:
+            logger.warning("Failed to get disk usage")
 
         # Get software versions
         software_diag = {
diff --git a/scos_actions/actions/acquire_stepped_freq_tdomain_iq.py b/scos_actions/actions/acquire_stepped_freq_tdomain_iq.py
index e8cc1d5f..bfb06d55 100644
--- a/scos_actions/actions/acquire_stepped_freq_tdomain_iq.py
+++ b/scos_actions/actions/acquire_stepped_freq_tdomain_iq.py
@@ -112,7 +112,6 @@ def __call__(self, sensor: Sensor, schedule_entry: dict, task_id: int):
             sigan_settings = self.get_sigan_settings(measurement_result)
             capture_segment = CaptureSegment(
                 sample_start=0,
-                global_index=saved_samples,
                 frequency=measurement_params[FREQUENCY],
                 datetime=measurement_result["capture_time"],
                 duration=duration_ms,
diff --git a/scos_actions/hardware/utils.py b/scos_actions/hardware/utils.py
index 49642da7..8a286e6d 100644
--- a/scos_actions/hardware/utils.py
+++ b/scos_actions/hardware/utils.py
@@ -1,6 +1,6 @@
 import logging
 import subprocess
-from typing import Dict
+from typing import Dict, Tuple, Union
 
 import psutil
 from its_preselector.web_relay import WebRelay
@@ -66,7 +66,7 @@ def get_current_cpu_temperature(fahrenheit: bool = False) -> float:
         raise e
 
 
-def get_disk_smart_data(disk: str) -> dict:
+def get_disk_smart_data(disk: str) -> Union[dict, str]:
     """
     Get selected SMART data for the chosen disk.
 
@@ -81,7 +81,8 @@ def get_disk_smart_data(disk: str) -> dict:
     https://nvmexpress.org/wp-content/uploads/NVM-Express-1_4-2019.06.10-Ratified.pdf
 
     :param disk: The desired disk, e.g., ``/dev/nvme0n1``.
-    :return: A dictionary containing the retrieved data from the SMART report.
+    :return: A dictionary containing the retrieved data from the SMART report, or
+        the string "Unavailable" if ``smartctl`` fails to run.
     """
     try:
         report = subprocess.check_output(["smartctl", "-a", disk]).decode("utf-8")
diff --git a/scos_actions/metadata/sigmf_builder.py b/scos_actions/metadata/sigmf_builder.py
index 2a838d82..2ed489e7 100644
--- a/scos_actions/metadata/sigmf_builder.py
+++ b/scos_actions/metadata/sigmf_builder.py
@@ -27,7 +27,7 @@
         },
         {
             "name": "ntia-diagnostics",
-            "version": "2.0.0",
+            "version": "2.2.0",
             "optional": True,
         },
         {
@@ -266,7 +266,7 @@ def set_collection(self, collection: str) -> None:
         """
         self.sigmf_md.set_global_field("core:collection", collection)
 
-    ### ntia-algorithm v2.0.0 ###
+    ### ntia-algorithm v2.0.1 ###
 
     def set_data_products(self, data_products: List[Graph]) -> None:
         """
@@ -311,7 +311,7 @@ def set_classification(self, classification: str) -> None:
         """
         self.sigmf_md.set_global_field("ntia-core:classification", classification)
 
-    ### ntia-diagnostics v1.0.0 ###
+    ### ntia-diagnostics v2.2.0 ###
 
     def set_diagnostics(self, diagnostics: Diagnostics) -> None:
         """
diff --git a/scos_actions/metadata/structs/ntia_diagnostics.py b/scos_actions/metadata/structs/ntia_diagnostics.py
index def0cbd5..a0ef7c8d 100644
--- a/scos_actions/metadata/structs/ntia_diagnostics.py
+++ b/scos_actions/metadata/structs/ntia_diagnostics.py
@@ -129,16 +129,20 @@ class Computer(msgspec.Struct, **SIGMF_OBJECT_KWARGS):
     :param cpu_mean_clock: Mean sampled clock speed, in MHz.
     :param cpu_uptime: Number of days since the computer started.
     :param action_cpu_usage: CPU utilization during action execution, as a percentage.
+    :param action_runtime: Total action execution time, in seconds.
     :param system_load_5m: Number of processes in a runnable state over the
         previous 5 minutes as a percentage of the number of CPUs.
     :param memory_usage: Average percent of memory used during action execution.
     :param cpu_overheating: Whether the CPU is overheating.
     :param cpu_temp: CPU temperature, in degrees Celsius.
-    :param scos_start: The time at which the SCOS API container started. Must be
+    :param software_start: The time at which the sensor software started. Must be
         an ISO 8601 formatted string.
-    :param scos_uptime: Number of days since the SCOS API container started.
+    :param software_uptime: Number of days since the sensor software started.
     :param ssd_smart_data: Information provided by the drive Self-Monitoring,
         Analysis, and Reporting Technology.
+    :param ntp_active: True if NTP service is active on the computer.
+    :param ntp_sync: True if the system clock is synchronized with NTP.
+    :param disk_usage: Total computer disk usage, as a percentage.
     """
 
     cpu_min_clock: Optional[float] = None
@@ -154,6 +158,9 @@ class Computer(msgspec.Struct, **SIGMF_OBJECT_KWARGS):
     software_start: Optional[str] = None
     software_uptime: Optional[float] = None
     ssd_smart_data: Optional[SsdSmartData] = None
+    ntp_active: Optional[bool] = None
+    ntp_sync: Optional[bool] = None
+    disk_usage: Optional[float] = None
 
 
 class ScosPlugin(msgspec.Struct, **SIGMF_OBJECT_KWARGS):
diff --git a/scos_actions/utils.py b/scos_actions/utils.py
index e70a4324..182474ce 100644
--- a/scos_actions/utils.py
+++ b/scos_actions/utils.py
@@ -1,5 +1,6 @@
 import json
 import logging
+import shutil
 from datetime import datetime
 from pathlib import Path
 
@@ -124,3 +125,11 @@ def get_days_up(start_time):
     days = elapsed.days
     fractional_day = elapsed.seconds / (60 * 60 * 24)
     return round(days + fractional_day, 4)
+
+
+def get_disk_usage() -> float:
+    """Return the total disk usage as a percentage."""
+    usage = shutil.disk_usage("/")
+    percent_used = round(100 * usage.used / usage.total)
+    logger.debug(f"{percent_used} disk used")
+    return round(percent_used, 2)