diff --git a/web/__test__/components/Onboarding/OnboardingInternalBootStep.test.ts b/web/__test__/components/Onboarding/OnboardingInternalBootStep.test.ts
index 75b06cad10..668e26d0ca 100644
--- a/web/__test__/components/Onboarding/OnboardingInternalBootStep.test.ts
+++ b/web/__test__/components/Onboarding/OnboardingInternalBootStep.test.ts
@@ -19,6 +19,7 @@ type MockInternalBootSelection = {
 };
 
 type InternalBootVm = {
+  poolMode: 'dedicated' | 'hybrid';
   getDeviceSelectItems: (index: number) => Array<{ value: string; label: string; disabled?: boolean }>;
 };
 
@@ -239,7 +240,7 @@ describe('OnboardingInternalBootStep', () => {
         {
           id: 'SMALL-1',
           device: '/dev/sde',
-          size: gib(6),
+          size: gib(5),
           serialNum: 'SMALL-1',
           interfaceType: DiskInterfaceType.SATA,
         },
@@ -433,7 +434,7 @@ describe('OnboardingInternalBootStep', () => {
         {
           id: 'SMALL-1',
           device: '/dev/sdb',
-          size: gib(6),
+          size: gib(5),
           serialNum: 'SMALL-1',
           interfaceType: DiskInterfaceType.SATA,
         },
@@ -481,6 +482,48 @@ describe('OnboardingInternalBootStep', () => {
     expect(wrapper.find('[data-testid="brand-button"]').attributes('disabled')).toBeUndefined();
   });
 
+  it('allows 6 GiB devices in dedicated mode but not hybrid mode', async () => {
+    draftStore.bootMode = 'storage';
+    contextResult.value = buildContext({
+      assignableDisks: [
+        {
+          id: 'DEDICATED-6GIB',
+          device: '/dev/sda',
+          size: gib(6),
+          serialNum: 'DEDICATED-6GIB',
+          interfaceType: DiskInterfaceType.SATA,
+        },
+        {
+          id: 'LARGER-DRIVE',
+          device: '/dev/sdb',
+          size: gib(32),
+          serialNum: 'LARGER-DRIVE',
+          interfaceType: DiskInterfaceType.SATA,
+        },
+      ],
+    });
+
+    const wrapper = mountComponent();
+    await flushPromises();
+
+    const vm = wrapper.vm as unknown as InternalBootVm;
+    expect(vm.poolMode).toBe('dedicated');
+    expect(vm.getDeviceSelectItems(0)).toEqual(
+      expect.arrayContaining([expect.objectContaining({ value: 'DEDICATED-6GIB' })])
+    );
+
+    vm.poolMode = 'hybrid';
+    await flushPromises();
+
+    expect(vm.getDeviceSelectItems(0)).not.toEqual(
+      expect.arrayContaining([expect.objectContaining({ value: 'DEDICATED-6GIB' })])
+    );
+    await wrapper.get('[data-testid="internal-boot-eligibility-toggle"]').trigger('click');
+    await flushPromises();
+    expect(wrapper.text()).toContain('DEDICATED-6GIB - 6.4 GB (sda)');
+    expect(wrapper.text()).toContain('TOO_SMALL');
+  });
+
   it('treats disks present in devs.ini as assignable', async () => {
     draftStore.bootMode = 'storage';
     contextResult.value = buildContext({
diff --git a/web/src/components/Onboarding/steps/OnboardingInternalBootStep.vue b/web/src/components/Onboarding/steps/OnboardingInternalBootStep.vue
index 2c8e9cc28d..fa75ffc1d7 100644
--- a/web/src/components/Onboarding/steps/OnboardingInternalBootStep.vue
+++ b/web/src/components/Onboarding/steps/OnboardingInternalBootStep.vue
@@ -74,7 +74,8 @@ type InternalBootDiskWarningCode = 'HAS_INTERNAL_BOOT_PARTITIONS';
 type InternalBootDiskIssueCode = InternalBootDiskEligibilityCode | InternalBootDiskWarningCode;
 
 const MIN_BOOT_SIZE_MIB = 4096;
-const MIN_ELIGIBLE_DEVICE_SIZE_MIB = MIN_BOOT_SIZE_MIB * 2;
+const MIN_DEDICATED_DEVICE_SIZE_MIB = 6144;
+const MIN_HYBRID_DEVICE_SIZE_MIB = MIN_BOOT_SIZE_MIB * 2;
 const DEFAULT_BOOT_SIZE_MIB = 16384;
 const BOOT_SIZE_PRESETS_MIB = [16384, 32768, 65536, 131072];
 const SYSTEM_ELIGIBILITY_MESSAGE_KEYS: Record<InternalBootSystemEligibilityCode, string> = {
@@ -170,8 +171,10 @@ const templateData = computed<InternalBootTemplateData | null>(() => {
       const sizeMiB = toSizeMiB(sizeBytes);
       const ineligibilityCodes: InternalBootDiskEligibilityCode[] = [];
       const warningCodes: InternalBootDiskWarningCode[] = [];
+      const minEligibleDeviceSizeMiB =
+        poolMode.value === 'dedicated' ? MIN_DEDICATED_DEVICE_SIZE_MIB : MIN_HYBRID_DEVICE_SIZE_MIB;
 
-      if (sizeMiB !== null && sizeMiB < MIN_ELIGIBLE_DEVICE_SIZE_MIB) {
+      if (sizeMiB !== null && sizeMiB < minEligibleDeviceSizeMiB) {
         ineligibilityCodes.push('TOO_SMALL');
       }