diff --git a/src/components/admin/storage-form-dialog.tsx b/src/components/admin/storage-form-dialog.tsx
deleted file mode 100644
index 37366364..00000000
--- a/src/components/admin/storage-form-dialog.tsx
+++ /dev/null
@@ -1,227 +0,0 @@
-import { zodResolver } from '@hookform/resolvers/zod'
-import type { Storage } from '@shared/types'
-import { useMutation, useQueryClient } from '@tanstack/react-query'
-import { Eye, EyeOff } from 'lucide-react'
-import type { ReactNode } from 'react'
-import { useEffect, useState } from 'react'
-import { useForm } from 'react-hook-form'
-import { useTranslation } from 'react-i18next'
-import { toast } from 'sonner'
-import { z } from 'zod'
-import { Button } from '@/components/ui/button'
-import { Dialog, DialogContent, DialogFooter, DialogHeader, DialogTitle } from '@/components/ui/dialog'
-import { Input } from '@/components/ui/input'
-import { Label } from '@/components/ui/label'
-import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
-import { createStorage, updateStorage } from '@/lib/api'
-import { formatSize } from '@/lib/format'
-
-const UNITS = { MB: 1024 * 1024, GB: 1024 * 1024 * 1024, TB: 1024 * 1024 * 1024 * 1024 } as const
-type Unit = keyof typeof UNITS
-
-function bytesToDisplay(bytes: number): { value: number; unit: Unit } {
-  if (bytes === 0) return { value: 0, unit: 'GB' }
-  if (bytes >= UNITS.TB && bytes % UNITS.TB === 0) return { value: bytes / UNITS.TB, unit: 'TB' }
-  if (bytes >= UNITS.GB && bytes % UNITS.GB === 0) return { value: bytes / UNITS.GB, unit: 'GB' }
-  return { value: bytes / UNITS.MB, unit: 'MB' }
-}
-
-const storageFormSchema = z.object({
-  title: z.string().min(1),
-  mode: z.enum(['private', 'public']),
-  bucket: z.string().min(1),
-  endpoint: z.string().url(),
-  region: z.string().min(1),
-  accessKey: z.string().min(1),
-  secretKey: z.string().min(1),
-  filePath: z.string().min(1),
-  customHost: z.string().optional(),
-  capacityValue: z.coerce.number().min(0),
-  capacityUnit: z.enum(['MB', 'GB', 'TB']),
-})
-
-type StorageFormValues = z.infer<typeof storageFormSchema>
-
-const DEFAULT_VALUES: StorageFormValues = {
-  title: '',
-  mode: 'private',
-  bucket: '',
-  endpoint: '',
-  region: 'auto',
-  accessKey: '',
-  secretKey: '',
-  filePath: '$UID/$RAW_NAME',
-  customHost: '',
-  capacityValue: 0,
-  capacityUnit: 'GB',
-}
-
-interface StorageFormDialogProps {
-  open: boolean
-  onOpenChange: (open: boolean) => void
-  storage: Storage | null
-}
-
-export function StorageFormDialog({ open, onOpenChange, storage }: StorageFormDialogProps) {
-  const { t } = useTranslation()
-  const queryClient = useQueryClient()
-  const [showSecret, setShowSecret] = useState(false)
-  const isEditing = storage !== null
-
-  const form = useForm<StorageFormValues>({
-    resolver: zodResolver(storageFormSchema),
-    defaultValues: DEFAULT_VALUES,
-  })
-
-  useEffect(() => {
-    if (!open) return
-    if (storage) {
-      const { value, unit } = bytesToDisplay(storage.capacity ?? 0)
-      form.reset({
-        title: storage.title,
-        mode: storage.mode,
-        bucket: storage.bucket,
-        endpoint: storage.endpoint,
-        region: storage.region,
-        accessKey: storage.accessKey,
-        secretKey: storage.secretKey,
-        filePath: storage.filePath,
-        customHost: storage.customHost || '',
-        capacityValue: value,
-        capacityUnit: unit,
-      })
-    } else {
-      form.reset(DEFAULT_VALUES)
-    }
-    setShowSecret(false)
-  }, [open, storage, form])
-
-  const mutation = useMutation({
-    mutationFn: ({ capacityValue, capacityUnit, ...rest }: StorageFormValues) => {
-      const capacity = capacityValue * UNITS[capacityUnit]
-      return isEditing ? updateStorage(storage.id, { ...rest, capacity }) : createStorage({ ...rest, capacity })
-    },
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['admin', 'storages'] })
-      onOpenChange(false)
-      toast.success(isEditing ? t('admin.storages.updated') : t('admin.storages.created'))
-    },
-    onError: (err) => {
-      toast.error(err.message)
-    },
-  })
-
-  function onSubmit(values: StorageFormValues) {
-    mutation.mutate(values)
-  }
-
-  return (
-    <Dialog open={open} onOpenChange={onOpenChange}>
-      <DialogContent className="max-w-lg">
-        <DialogHeader>
-          <DialogTitle>{isEditing ? t('admin.storages.editTitle') : t('admin.storages.addTitle')}</DialogTitle>
-        </DialogHeader>
-        <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-4">
-          <div className="grid gap-4">
-            <FormField label={t('admin.storages.fieldTitle')} error={form.formState.errors.title?.message}>
-              <Input {...form.register('title')} />
-            </FormField>
-
-            <FormField label={t('admin.storages.fieldMode')} error={form.formState.errors.mode?.message}>
-              <select
-                {...form.register('mode')}
-                className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-xs transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
-              >
-                <option value="private">{t('admin.storages.modePrivate')}</option>
-                <option value="public">{t('admin.storages.modePublic')}</option>
-              </select>
-            </FormField>
-
-            <FormField label={t('admin.storages.fieldBucket')} error={form.formState.errors.bucket?.message}>
-              <Input {...form.register('bucket')} />
-            </FormField>
-
-            <FormField label={t('admin.storages.fieldEndpoint')} error={form.formState.errors.endpoint?.message}>
-              <Input {...form.register('endpoint')} placeholder="https://s3.amazonaws.com" />
-            </FormField>
-
-            <FormField label={t('admin.storages.fieldRegion')} error={form.formState.errors.region?.message}>
-              <Input {...form.register('region')} placeholder="auto" />
-            </FormField>
-
-            <FormField label={t('admin.storages.fieldAccessKey')} error={form.formState.errors.accessKey?.message}>
-              <Input {...form.register('accessKey')} />
-            </FormField>
-
-            <FormField label={t('admin.storages.fieldSecretKey')} error={form.formState.errors.secretKey?.message}>
-              <div className="relative">
-                <Input {...form.register('secretKey')} type={showSecret ? 'text' : 'password'} className="pr-10" />
-                <Button
-                  type="button"
-                  variant="ghost"
-                  size="icon-xs"
-                  className="absolute right-2 top-1/2 -translate-y-1/2"
-                  onClick={() => setShowSecret((v) => !v)}
-                >
-                  {showSecret ? <EyeOff className="h-4 w-4" /> : <Eye className="h-4 w-4" />}
-                </Button>
-              </div>
-            </FormField>
-
-            <FormField label={t('admin.storages.fieldFilePath')} error={form.formState.errors.filePath?.message}>
-              <Input {...form.register('filePath')} placeholder="$UID/$RAW_NAME" />
-            </FormField>
-
-            <FormField label={t('admin.storages.fieldCustomHost')} error={form.formState.errors.customHost?.message}>
-              <Input {...form.register('customHost')} placeholder={t('admin.storages.customHostPlaceholder')} />
-            </FormField>
-
-            <FormField label={t('admin.storages.fieldCapacity')} error={form.formState.errors.capacityValue?.message}>
-              <div className="flex items-center gap-2">
-                <Input type="number" min={0} step={1} className="w-32" {...form.register('capacityValue')} />
-                <Select
-                  value={form.watch('capacityUnit')}
-                  onValueChange={(v) => form.setValue('capacityUnit', v as Unit)}
-                >
-                  <SelectTrigger className="w-24">
-                    <SelectValue />
-                  </SelectTrigger>
-                  <SelectContent>
-                    <SelectItem value="MB">MB</SelectItem>
-                    <SelectItem value="GB">GB</SelectItem>
-                    <SelectItem value="TB">TB</SelectItem>
-                  </SelectContent>
-                </Select>
-                <span className="text-sm text-muted-foreground">
-                  {form.watch('capacityValue') > 0
-                    ? `= ${formatSize(form.watch('capacityValue') * UNITS[form.watch('capacityUnit')])}`
-                    : t('admin.storages.capacityUnlimited')}
-                </span>
-              </div>
-              <p className="text-xs text-muted-foreground">{t('admin.storages.capacityHint')}</p>
-            </FormField>
-          </div>
-
-          <DialogFooter>
-            <Button type="button" variant="outline" onClick={() => onOpenChange(false)}>
-              {t('common.cancel')}
-            </Button>
-            <Button type="submit" disabled={mutation.isPending}>
-              {mutation.isPending ? t('common.loading') : t('common.save')}
-            </Button>
-          </DialogFooter>
-        </form>
-      </DialogContent>
-    </Dialog>
-  )
-}
-
-function FormField({ label, error, children }: { label: string; error?: string; children: ReactNode }) {
-  return (
-    <div className="space-y-1.5">
-      <Label>{label}</Label>
-      {children}
-      {error && <p className="text-xs text-destructive">{error}</p>}
-    </div>
-  )
-}
diff --git a/src/components/admin/storage-form-drawer.tsx b/src/components/admin/storage-form-drawer.tsx
new file mode 100644
index 00000000..500af6f6
--- /dev/null
+++ b/src/components/admin/storage-form-drawer.tsx
@@ -0,0 +1,229 @@
+import { zodResolver } from '@hookform/resolvers/zod'
+import type { Storage } from '@shared/types'
+import { useMutation, useQueryClient } from '@tanstack/react-query'
+import { Eye, EyeOff } from 'lucide-react'
+import type { ReactNode } from 'react'
+import { useEffect, useState } from 'react'
+import { useForm } from 'react-hook-form'
+import { useTranslation } from 'react-i18next'
+import { toast } from 'sonner'
+import { z } from 'zod'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
+import { Sheet, SheetContent, SheetFooter, SheetHeader, SheetTitle } from '@/components/ui/sheet'
+import { createStorage, updateStorage } from '@/lib/api'
+import { formatSize } from '@/lib/format'
+
+const UNITS = { MB: 1024 * 1024, GB: 1024 * 1024 * 1024, TB: 1024 * 1024 * 1024 * 1024 } as const
+type Unit = keyof typeof UNITS
+
+function bytesToDisplay(bytes: number): { value: number; unit: Unit } {
+  if (bytes === 0) return { value: 0, unit: 'GB' }
+  if (bytes >= UNITS.TB && bytes % UNITS.TB === 0) return { value: bytes / UNITS.TB, unit: 'TB' }
+  if (bytes >= UNITS.GB && bytes % UNITS.GB === 0) return { value: bytes / UNITS.GB, unit: 'GB' }
+  return { value: bytes / UNITS.MB, unit: 'MB' }
+}
+
+const storageFormSchema = z.object({
+  title: z.string().min(1),
+  mode: z.enum(['private', 'public']),
+  bucket: z.string().min(1),
+  endpoint: z.string().url(),
+  region: z.string().min(1),
+  accessKey: z.string().min(1),
+  secretKey: z.string().min(1),
+  filePath: z.string().min(1),
+  customHost: z.string().optional(),
+  capacityValue: z.coerce.number().min(0),
+  capacityUnit: z.enum(['MB', 'GB', 'TB']),
+})
+
+type StorageFormValues = z.infer<typeof storageFormSchema>
+
+const DEFAULT_VALUES: StorageFormValues = {
+  title: '',
+  mode: 'private',
+  bucket: '',
+  endpoint: '',
+  region: 'auto',
+  accessKey: '',
+  secretKey: '',
+  filePath: '$UID/$RAW_NAME',
+  customHost: '',
+  capacityValue: 0,
+  capacityUnit: 'GB',
+}
+
+interface StorageFormDrawerProps {
+  open: boolean
+  onOpenChange: (open: boolean) => void
+  storage: Storage | null
+}
+
+export function StorageFormDrawer({ open, onOpenChange, storage }: StorageFormDrawerProps) {
+  const { t } = useTranslation()
+  const queryClient = useQueryClient()
+  const [showSecret, setShowSecret] = useState(false)
+  const isEditing = storage !== null
+
+  const form = useForm<StorageFormValues>({
+    resolver: zodResolver(storageFormSchema),
+    defaultValues: DEFAULT_VALUES,
+  })
+
+  useEffect(() => {
+    if (!open) return
+    if (storage) {
+      const { value, unit } = bytesToDisplay(storage.capacity ?? 0)
+      form.reset({
+        title: storage.title,
+        mode: storage.mode,
+        bucket: storage.bucket,
+        endpoint: storage.endpoint,
+        region: storage.region,
+        accessKey: storage.accessKey,
+        secretKey: storage.secretKey,
+        filePath: storage.filePath,
+        customHost: storage.customHost || '',
+        capacityValue: value,
+        capacityUnit: unit,
+      })
+    } else {
+      form.reset(DEFAULT_VALUES)
+    }
+    setShowSecret(false)
+  }, [open, storage, form])
+
+  const mutation = useMutation({
+    mutationFn: ({ capacityValue, capacityUnit, ...rest }: StorageFormValues) => {
+      const capacity = capacityValue * UNITS[capacityUnit]
+      return isEditing ? updateStorage(storage.id, { ...rest, capacity }) : createStorage({ ...rest, capacity })
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['admin', 'storages'] })
+      onOpenChange(false)
+      toast.success(isEditing ? t('admin.storages.updated') : t('admin.storages.created'))
+    },
+    onError: (err) => {
+      toast.error(err.message)
+    },
+  })
+
+  function onSubmit(values: StorageFormValues) {
+    mutation.mutate(values)
+  }
+
+  return (
+    <Sheet open={open} onOpenChange={onOpenChange}>
+      <SheetContent side="right" className="sm:max-w-lg">
+        <SheetHeader>
+          <SheetTitle>{isEditing ? t('admin.storages.editTitle') : t('admin.storages.addTitle')}</SheetTitle>
+        </SheetHeader>
+        <form onSubmit={form.handleSubmit(onSubmit)} className="flex flex-1 flex-col overflow-hidden">
+          <div className="flex-1 overflow-y-auto px-4">
+            <div className="grid gap-4">
+              <FormField label={t('admin.storages.fieldTitle')} error={form.formState.errors.title?.message}>
+                <Input {...form.register('title')} />
+              </FormField>
+
+              <FormField label={t('admin.storages.fieldMode')} error={form.formState.errors.mode?.message}>
+                <select
+                  {...form.register('mode')}
+                  className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-xs transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
+                >
+                  <option value="private">{t('admin.storages.modePrivate')}</option>
+                  <option value="public">{t('admin.storages.modePublic')}</option>
+                </select>
+              </FormField>
+
+              <FormField label={t('admin.storages.fieldBucket')} error={form.formState.errors.bucket?.message}>
+                <Input {...form.register('bucket')} />
+              </FormField>
+
+              <FormField label={t('admin.storages.fieldEndpoint')} error={form.formState.errors.endpoint?.message}>
+                <Input {...form.register('endpoint')} placeholder="https://s3.amazonaws.com" />
+              </FormField>
+
+              <FormField label={t('admin.storages.fieldRegion')} error={form.formState.errors.region?.message}>
+                <Input {...form.register('region')} placeholder="auto" />
+              </FormField>
+
+              <FormField label={t('admin.storages.fieldAccessKey')} error={form.formState.errors.accessKey?.message}>
+                <Input {...form.register('accessKey')} />
+              </FormField>
+
+              <FormField label={t('admin.storages.fieldSecretKey')} error={form.formState.errors.secretKey?.message}>
+                <div className="relative">
+                  <Input {...form.register('secretKey')} type={showSecret ? 'text' : 'password'} className="pr-10" />
+                  <Button
+                    type="button"
+                    variant="ghost"
+                    size="icon-xs"
+                    className="absolute right-2 top-1/2 -translate-y-1/2"
+                    onClick={() => setShowSecret((v) => !v)}
+                  >
+                    {showSecret ? <EyeOff className="h-4 w-4" /> : <Eye className="h-4 w-4" />}
+                  </Button>
+                </div>
+              </FormField>
+
+              <FormField label={t('admin.storages.fieldFilePath')} error={form.formState.errors.filePath?.message}>
+                <Input {...form.register('filePath')} placeholder="$UID/$RAW_NAME" />
+              </FormField>
+
+              <FormField label={t('admin.storages.fieldCustomHost')} error={form.formState.errors.customHost?.message}>
+                <Input {...form.register('customHost')} placeholder={t('admin.storages.customHostPlaceholder')} />
+              </FormField>
+
+              <FormField label={t('admin.storages.fieldCapacity')} error={form.formState.errors.capacityValue?.message}>
+                <div className="flex items-center gap-2">
+                  <Input type="number" min={0} step={1} className="w-32" {...form.register('capacityValue')} />
+                  <Select
+                    value={form.watch('capacityUnit')}
+                    onValueChange={(v) => form.setValue('capacityUnit', v as Unit)}
+                  >
+                    <SelectTrigger className="w-24">
+                      <SelectValue />
+                    </SelectTrigger>
+                    <SelectContent>
+                      <SelectItem value="MB">MB</SelectItem>
+                      <SelectItem value="GB">GB</SelectItem>
+                      <SelectItem value="TB">TB</SelectItem>
+                    </SelectContent>
+                  </Select>
+                  <span className="text-sm text-muted-foreground">
+                    {form.watch('capacityValue') > 0
+                      ? `= ${formatSize(form.watch('capacityValue') * UNITS[form.watch('capacityUnit')])}`
+                      : t('admin.storages.capacityUnlimited')}
+                  </span>
+                </div>
+                <p className="text-xs text-muted-foreground">{t('admin.storages.capacityHint')}</p>
+              </FormField>
+            </div>
+          </div>
+
+          <SheetFooter>
+            <Button type="button" variant="outline" onClick={() => onOpenChange(false)}>
+              {t('common.cancel')}
+            </Button>
+            <Button type="submit" disabled={mutation.isPending}>
+              {mutation.isPending ? t('common.loading') : t('common.save')}
+            </Button>
+          </SheetFooter>
+        </form>
+      </SheetContent>
+    </Sheet>
+  )
+}
+
+function FormField({ label, error, children }: { label: string; error?: string; children: ReactNode }) {
+  return (
+    <div className="space-y-1.5">
+      <Label>{label}</Label>
+      {children}
+      {error && <p className="text-xs text-destructive">{error}</p>}
+    </div>
+  )
+}
diff --git a/src/i18n/admin-storages-locale.test.ts b/src/i18n/admin-storages-locale.test.ts
index 0fe88042..6c5c3d17 100644
--- a/src/i18n/admin-storages-locale.test.ts
+++ b/src/i18n/admin-storages-locale.test.ts
@@ -38,6 +38,9 @@ const ADMIN_STORAGES_KEYS = [
   'admin.storages.fieldFilePath',
   'admin.storages.fieldCustomHost',
   'admin.storages.customHostPlaceholder',
+  'admin.storages.fieldCapacity',
+  'admin.storages.capacityUnlimited',
+  'admin.storages.capacityHint',
 ]
 
 const ADMIN_NAV_KEYS = ['admin.nav.management', 'admin.nav.storages', 'admin.nav.users']
@@ -173,6 +176,18 @@ describe('admin.storages locale keys — English values contract', () => {
   it('admin.nav.users is "Users"', () => {
     expect(enLocale['admin.nav.users']).toBe('Users')
   })
+
+  it('admin.storages.fieldCapacity is "Capacity"', () => {
+    expect(enLocale['admin.storages.fieldCapacity']).toBe('Capacity')
+  })
+
+  it('admin.storages.capacityUnlimited is "Unlimited"', () => {
+    expect(enLocale['admin.storages.capacityUnlimited']).toBe('Unlimited')
+  })
+
+  it('admin.storages.capacityHint is "Maximum storage space. 0 means unlimited."', () => {
+    expect(enLocale['admin.storages.capacityHint']).toBe('Maximum storage space. 0 means unlimited.')
+  })
 })
 
 describe('admin.storages locale keys — i18n runtime translation', () => {
@@ -328,4 +343,40 @@ describe('admin.storages locale keys — i18n runtime translation', () => {
     await i18n.changeLanguage('zh')
     expect(i18n.t('admin.nav.management')).toBe('管理')
   })
+
+  it('translates admin.storages.fieldCapacity to English', async () => {
+    const { default: i18n } = await import('./index')
+    await i18n.changeLanguage('en')
+    expect(i18n.t('admin.storages.fieldCapacity')).toBe('Capacity')
+  })
+
+  it('translates admin.storages.fieldCapacity to Chinese', async () => {
+    const { default: i18n } = await import('./index')
+    await i18n.changeLanguage('zh')
+    expect(i18n.t('admin.storages.fieldCapacity')).toBe('可用空间')
+  })
+
+  it('translates admin.storages.capacityUnlimited to English', async () => {
+    const { default: i18n } = await import('./index')
+    await i18n.changeLanguage('en')
+    expect(i18n.t('admin.storages.capacityUnlimited')).toBe('Unlimited')
+  })
+
+  it('translates admin.storages.capacityUnlimited to Chinese', async () => {
+    const { default: i18n } = await import('./index')
+    await i18n.changeLanguage('zh')
+    expect(i18n.t('admin.storages.capacityUnlimited')).toBe('不限制')
+  })
+
+  it('translates admin.storages.capacityHint to English', async () => {
+    const { default: i18n } = await import('./index')
+    await i18n.changeLanguage('en')
+    expect(i18n.t('admin.storages.capacityHint')).toBe('Maximum storage space. 0 means unlimited.')
+  })
+
+  it('translates admin.storages.capacityHint to Chinese', async () => {
+    const { default: i18n } = await import('./index')
+    await i18n.changeLanguage('zh')
+    expect(i18n.t('admin.storages.capacityHint')).toBe('最大存储空间，0 表示不限制。')
+  })
 })
diff --git a/src/lib/format.test.ts b/src/lib/format.test.ts
new file mode 100644
index 00000000..ac7b9968
--- /dev/null
+++ b/src/lib/format.test.ts
@@ -0,0 +1,74 @@
+import { describe, expect, it } from 'vitest'
+import { formatDate, formatSize } from './format'
+
+describe('formatSize', () => {
+  it('returns "0 B" for 0 bytes', () => {
+    expect(formatSize(0)).toBe('0 B')
+  })
+
+  it('returns bytes with no decimal for values under 1 KB', () => {
+    expect(formatSize(512)).toBe('512 B')
+  })
+
+  it('returns KB with one decimal for kilobyte values', () => {
+    expect(formatSize(1024)).toBe('1.0 KB')
+  })
+
+  it('returns MB with one decimal for megabyte values', () => {
+    expect(formatSize(1024 * 1024)).toBe('1.0 MB')
+  })
+
+  it('returns GB with one decimal for gigabyte values', () => {
+    expect(formatSize(1024 * 1024 * 1024)).toBe('1.0 GB')
+  })
+
+  it('returns TB with one decimal for terabyte values', () => {
+    expect(formatSize(1024 * 1024 * 1024 * 1024)).toBe('1.0 TB')
+  })
+
+  it('returns fractional KB for values between 1 KB and 1 MB', () => {
+    expect(formatSize(1536)).toBe('1.5 KB')
+  })
+
+  it('returns fractional GB for non-round gigabyte values', () => {
+    expect(formatSize(1.5 * 1024 * 1024 * 1024)).toBe('1.5 GB')
+  })
+
+  it('returns single byte without decimal', () => {
+    expect(formatSize(1)).toBe('1 B')
+  })
+
+  it('returns 10 GB correctly', () => {
+    expect(formatSize(10 * 1024 * 1024 * 1024)).toBe('10.0 GB')
+  })
+
+  it('returns 100 MB correctly', () => {
+    expect(formatSize(100 * 1024 * 1024)).toBe('100.0 MB')
+  })
+})
+
+describe('formatDate', () => {
+  it('returns a locale date string for a valid ISO timestamp', () => {
+    const result = formatDate('2024-01-15T00:00:00.000Z')
+    expect(result).toBeTruthy()
+    expect(result).not.toBe('—')
+  })
+
+  it('returns "—" for an empty string', () => {
+    expect(formatDate('')).toBe('—')
+  })
+
+  it('returns "—" for a non-date string', () => {
+    expect(formatDate('not-a-date')).toBe('—')
+  })
+
+  it('returns "—" for a random invalid string', () => {
+    expect(formatDate('foobar')).toBe('—')
+  })
+
+  it('returns a non-empty string for a valid Unix epoch string', () => {
+    const result = formatDate('2000-06-15')
+    expect(result).toBeTruthy()
+    expect(result).not.toBe('—')
+  })
+})
diff --git a/src/routes/_authenticated/admin/storages/index.tsx b/src/routes/_authenticated/admin/storages/index.tsx
index 1605d948..00880aca 100644
--- a/src/routes/_authenticated/admin/storages/index.tsx
+++ b/src/routes/_authenticated/admin/storages/index.tsx
@@ -1,3 +1,4 @@
+import { StorageStatus } from '@shared/constants'
 import type { Storage } from '@shared/types'
 import { useQuery } from '@tanstack/react-query'
 import { createFileRoute } from '@tanstack/react-router'
@@ -5,7 +6,7 @@ import { Database, Pencil, Plus, Trash2 } from 'lucide-react'
 import { useState } from 'react'
 import { useTranslation } from 'react-i18next'
 import { DeleteStorageDialog } from '@/components/admin/delete-storage-dialog'
-import { StorageFormDialog } from '@/components/admin/storage-form-dialog'
+import { StorageFormDrawer } from '@/components/admin/storage-form-drawer'
 import { Button } from '@/components/ui/button'
 import { listStorages } from '@/lib/api'
 
@@ -13,8 +14,6 @@ export const Route = createFileRoute('/_authenticated/admin/storages/')({
   component: StoragesPage,
 })
 
-import { StorageStatus } from '@shared/constants'
-
 function StoragesPage() {
   const { t } = useTranslation()
   const [formOpen, setFormOpen] = useState(false)
@@ -96,7 +95,7 @@ function StoragesPage() {
         </table>
       </div>
 
-      <StorageFormDialog open={formOpen} onOpenChange={handleFormOpenChange} storage={editingStorage} />
+      <StorageFormDrawer open={formOpen} onOpenChange={handleFormOpenChange} storage={editingStorage} />
 
       <DeleteStorageDialog
         open={deleteTarget !== null}