diff --git a/.bin/Scripts/functions/hw_diags.py b/.bin/Scripts/functions/hw_diags.py
index e1dc4a42..fa0e7209 100644
--- a/.bin/Scripts/functions/hw_diags.py
+++ b/.bin/Scripts/functions/hw_diags.py
@@ -39,6 +39,11 @@ TESTS = {
         'Results': {},
         'Status': {},
         },
+    'iobenchmark': {
+        'Enabled': False,
+        'Results': {},
+        'Status': {},
+        },
     }
 
 def get_smart_details(dev):
@@ -66,15 +71,17 @@ def menu_diags(*args):
     """Main HW-Diagnostic menu."""
     diag_modes = [
         {'Name': 'All tests',
-            'Tests': ['Prime95', 'NVMe/SMART', 'badblocks']},
+            'Tests': ['Prime95', 'NVMe/SMART', 'badblocks', 'iobenchmark']},
         {'Name': 'Prime95',
             'Tests': ['Prime95']},
-        {'Name': 'NVMe/SMART & badblocks',
-            'Tests': ['NVMe/SMART', 'badblocks']},
+        {'Name': 'All drive tests',
+            'Tests': ['NVMe/SMART', 'badblocks', 'iobenchmark']},
         {'Name': 'NVMe/SMART',
             'Tests': ['NVMe/SMART']},
         {'Name': 'badblocks',
             'Tests': ['badblocks']},
+        {'Name': 'I/O Benchmark',
+            'Tests': ['iobenchmark']},
         {'Name': 'Quick drive test',
             'Tests': ['Quick', 'NVMe/SMART']},
         ]
@@ -197,6 +204,75 @@ def run_badblocks():
     run_program('tmux kill-pane -a'.split(), check=False)
     pass
 
+def run_iobenchmark():
+    """Run a read-only test for all detected disks."""
+    aborted = False
+    clear_screen()
+    print_log('\nStart I/O Benchmark test(s)\n')
+    progress_file = '{}/iobenchmark_progress.out'.format(global_vars['LogDir'])
+    update_progress()
+
+    # Set Window layout and start test
+    run_program('tmux split-window -dhl 15 watch -c -n1 -t cat {}'.format(
+        TESTS['Progress Out']).split())
+
+    # Show disk details
+    for name, dev in sorted(TESTS['iobenchmark']['Devices'].items()):
+        show_disk_details(dev)
+        print_standard(' ')
+    update_progress()
+
+    # Run
+    print_standard('Running benchmark test(s):')
+    for name, dev in sorted(TESTS['iobenchmark']['Devices'].items()):
+        cur_status = TESTS['iobenchmark']['Status'][name]
+        nvme_smart_status = TESTS['NVMe/SMART']['Status'].get(name, None)
+        bb_status = TESTS['badblocks']['Status'].get(name, None)
+        if cur_status == 'Denied':
+            # Skip denied disks
+            continue
+        if nvme_smart_status == 'NS':
+            TESTS['iobenchmark']['Status'][name] = 'Skipped'
+        elif bb_status in ['NS', 'Skipped']:
+            TESTS['iobenchmark']['Status'][name] = 'Skipped'
+        else:
+            # (SMART tests not run or CS/OVERRIDE)
+            #   AND (BADBLOCKS tests not run or CS)
+            TESTS['iobenchmark']['Status'][name] = 'Working'
+            update_progress()
+            print_standard('  /dev/{:11}  '.format(name+'...'), end='', flush=True)
+            run_program('tmux split-window -dl 5 {} {} {}'.format(
+                'hw-diags-iobenchmark',
+                '/dev/{}'.format(name),
+                progress_file).split())
+            wait_for_process('dd')
+            print_standard('Done', timestamp=False)
+
+            # Check results
+            with open(progress_file, 'r') as f:
+                text = f.read()
+                io_stats = text.replace('\r', '\n').split('\n')
+                try:
+                    io_stats = [re.sub(r'.*\s+(\d+) MB/s\s*$', r'\1', stat)
+                        for stat in io_stats if 'MB/s' in stat]
+                    io_stats = [int(x) for x in io_stats]
+                    TESTS['iobenchmark']['Results'][name] = 'Read speed: {:0.0f} MB/s (Min: {}, Max: {})'.format(
+                        sum(io_stats) / len(io_stats),
+                        min(io_stats),
+                        max(io_stats))
+                    TESTS['iobenchmark']['Status'][name] = 'CS'
+                except:
+                    TESTS['iobenchmark']['Status'][name] = 'NS'
+
+            # Move temp file
+            shutil.move(progress_file, '{}/iobenchmark-{}.log'.format(
+                global_vars['LogDir'], name))
+        update_progress()
+
+    # Done
+    run_program('tmux kill-pane -a'.split(), check=False)
+    pass
+
 def run_mprime():
     """Run Prime95 for MPRIME_LIMIT minutes while showing the temps."""
     aborted = False
@@ -389,12 +465,12 @@ def run_tests(tests):
     print_log('Starting Hardware Diagnostics')
     print_log('\nRunning tests: {}'.format(', '.join(tests)))
     # Enable selected tests
-    for t in ['Prime95', 'NVMe/SMART', 'badblocks']:
+    for t in ['Prime95', 'NVMe/SMART', 'badblocks', 'iobenchmark']:
         TESTS[t]['Enabled'] = t in tests
     TESTS['NVMe/SMART']['Quick'] = 'Quick' in tests
 
     # Initialize
-    if TESTS['NVMe/SMART']['Enabled'] or TESTS['badblocks']['Enabled']:
+    if TESTS['NVMe/SMART']['Enabled'] or TESTS['badblocks']['Enabled'] or TESTS['iobenchmark']['Enabled']:
         scan_disks()
     update_progress()
 
@@ -410,6 +486,8 @@ def run_tests(tests):
             run_nvme_smart()
         if TESTS['badblocks']['Enabled']:
             run_badblocks()
+        if TESTS['iobenchmark']['Enabled']:
+            run_iobenchmark()
     
     # Show results
     show_results()
@@ -437,6 +515,7 @@ def scan_disks():
                 devs[d['name']] = {'lsblk': d}
                 TESTS['NVMe/SMART']['Status'][d['name']] = 'Pending'
                 TESTS['badblocks']['Status'][d['name']] = 'Pending'
+                TESTS['iobenchmark']['Status'][d['name']] = 'Pending'
             else:
                 # Skip WizardKit devices
                 wk_label = '{}_LINUX'.format(KIT_NAME_SHORT)
@@ -444,6 +523,7 @@ def scan_disks():
                     devs[d['name']] = {'lsblk': d}
                     TESTS['NVMe/SMART']['Status'][d['name']] = 'Pending'
                     TESTS['badblocks']['Status'][d['name']] = 'Pending'
+                    TESTS['iobenchmark']['Status'][d['name']] = 'Pending'
     
     for dev, data in devs.items():
         # Get SMART attributes
@@ -483,7 +563,7 @@ def scan_disks():
             data['SMART Support'] = False
             
         # Ask for manual overrides if necessary
-        if not data['Quick Health OK'] and TESTS['badblocks']['Enabled']:
+        if not data['Quick Health OK'] and (TESTS['badblocks']['Enabled'] or TESTS['iobenchmark']['Enabled']):
             show_disk_details(data)
             print_warning("WARNING: Health can't be confirmed for: {}".format(
                 '/dev/{}'.format(dev)))
@@ -494,10 +574,12 @@ def scan_disks():
             else:
                 TESTS['NVMe/SMART']['Status'][dev_name] = 'NS'
                 TESTS['badblocks']['Status'][dev_name] = 'Denied'
+                TESTS['iobenchmark']['Status'][dev_name] = 'Denied'
             print_standard(' ') # In case there's more than one "OVERRIDE" disk
 
     TESTS['NVMe/SMART']['Devices'] = devs
     TESTS['badblocks']['Devices'] = devs
+    TESTS['iobenchmark']['Devices'] = devs
 
 def show_disk_details(dev):
     """Display disk details."""
@@ -616,8 +698,8 @@ def show_results():
                 print('  {}'.format(line.strip()))
         print_standard(' ')
 
-    # NVMe/SMART / badblocks
-    if TESTS['NVMe/SMART']['Enabled'] or TESTS['badblocks']['Enabled']:
+    # NVMe/SMART / badblocks / iobenchmark
+    if TESTS['NVMe/SMART']['Enabled'] or TESTS['badblocks']['Enabled'] or TESTS['iobenchmark']['Enabled']:
         print_success('Disks:')
         for name, dev in sorted(TESTS['NVMe/SMART']['Devices'].items()):
             show_disk_details(dev)
@@ -635,6 +717,12 @@ def show_results():
                             print_standard('  {}'.format(line))
                         else:
                             print_error('  {}'.format(line))
+            io_status = TESTS['iobenchmark']['Status'].get(name, None)
+            if (TESTS['iobenchmark']['Enabled']
+                and io_status not in ['Denied', 'OVERRIDE', 'Skipped']):
+                print_info('Benchmark:')
+                result = TESTS['iobenchmark']['Results'].get(name, '')
+                print_standard('  {}'.format(result))
             print_standard(' ')
 
     # Done
@@ -676,6 +764,16 @@ def update_progress():
                 s_color = get_status_color(status),
                 status = status,
                 **COLORS))
+    if TESTS['iobenchmark']['Enabled']:
+        output.append(' ')
+        output.append('{BLUE}I/O Benchmark{CLEAR}'.format(**COLORS))
+        for dev, status in sorted(TESTS['iobenchmark']['Status'].items()):
+            output.append('{dev}{s_color}{status:>{pad}}{CLEAR}'.format(
+                dev = dev,
+                pad = 15-len(dev),
+                s_color = get_status_color(status),
+                status = status,
+                **COLORS))
 
     # Add line-endings
     output = ['{}\n'.format(line) for line in output]
diff --git a/.bin/Scripts/hw-diags-iobenchmark b/.bin/Scripts/hw-diags-iobenchmark
new file mode 100644
index 00000000..7d1f69d8
--- /dev/null
+++ b/.bin/Scripts/hw-diags-iobenchmark
@@ -0,0 +1,18 @@
+#!/bin/bash
+#
+## Wizard Kit: HW Diagnostics - Benchmarks
+
+function usage {
+    echo "Usage: ${0} device log-file"
+    echo "  e.g. ${0} /dev/sda /tmp/tmp.XXXXXXX/benchmarks.log"
+}
+
+# Bail early
+if [ ! -b "${1}" ]; then
+    usage
+    exit 1
+fi
+
+# Run Benchmarks
+echo 3 | sudo tee -a /proc/sys/vm/drop_caches >/dev/null 2>&1
+sudo dd bs=4M count=4096 if="${1}" of=/dev/null status=progress 2>&1 | tee -a "${2}"