diff --git a/README.md b/README.md
index f20dced..9f228c7 100644
--- a/README.md
+++ b/README.md
@@ -30,32 +30,46 @@ npm install --save chdman
 ```javascript
 import chdman from 'chdman';
 
+/**
+ * Create and extract hard disks
+ */
+await chdman.createHd({
+  inputFilename: 'original-image',
+  outputFilename: 'image.chd',
+});
+console.log(await chdman.info('image.chd'));
+// { inputFile: 'image.chd', fileVersion: 5, ... }
+await chdman.extractHd({
+  inputFilename: 'image.chd',
+  outputFilename: 'extracted-image',
+});
+
 /**
  * Create and extract CD-ROMs
  */
 await chdman.createCd({
   inputFilename: 'Original.cue',
-  outputFilename: 'Disc.chd',
+  outputFilename: 'CD.chd',
 });
-console.log(await chdman.info('Disc.chd'));
-// { inputFile: 'Disc.chd', fileVersion: 5, ... }
+console.log(await chdman.info('CD.chd'));
+// { inputFile: 'CD.chd', fileVersion: 5, ... }
 await chdman.extractCd({
-  inputFilename: 'Disc.chd',
+  inputFilename: 'CD.chd',
   outputFilename: 'Extracted.cue',
   outputBinFilename: 'Extracted.bin',
 });
 
 /**
- * Create and extract hard disks
+ * Create and extract DVD-ROMs
  */
-await chdman.createHd({
-  inputFilename: 'original-image',
-  outputFilename: 'image.chd',
+await chdman.createDvd({
+  inputFilename: 'Original.iso',
+  outputFilename: 'DVD.chd',
 });
-console.log(await chdman.info('image.chd'));
-// { inputFile: 'image.chd', fileVersion: 5, ... }
-await chdman.extractHd({
-  inputFilename: 'image.chd',
-  outputFilename: 'extracted-image',
+console.log(await chdman.info('DVD.chd'));
+// { inputFile: 'DVD.chd', fileVersion: 5, ... }
+await chdman.extractDvd({
+  inputFilename: 'DVD.chd',
+  outputFilename: 'Extracted.iso',
 });
 ```
diff --git a/index.ts b/index.ts
index 43c069b..bd4177b 100644
--- a/index.ts
+++ b/index.ts
@@ -3,6 +3,7 @@ import ChdmanBin from './src/chdman/chdmanBin.js';
 import ChdmanHd from './src/chdman/chdmanHd.js';
 import ChdmanCd from './src/chdman/chdmanCd.js';
 import ChdmanVerify from './src/chdman/chdmanVerify.js';
+import ChdmanDvd from './src/chdman/chdmanDvd.js';
 
 export default {
   run: ChdmanBin.run,
@@ -14,53 +15,13 @@ export default {
   // TODO(cemmer): createraw
   createHd: ChdmanHd.createHd,
   createCd: ChdmanCd.createCd,
-  // TODO(cemmer): createdvd
+  createDvd: ChdmanDvd.createDvd,
   // TODO(cemmer): createld
 
-  /**
-   * Automatically extract a CHD.
-   */
-  async extract(inputChdFilename: string, outputFilename: string): Promise<string> {
-    const info = await this.info({ inputFilename: inputChdFilename });
-    const metadataTags = new Set(info.metadata
-      .map((metadata) => metadata.tag));
-
-    if (metadataTags.has('GDDD')) {
-      await this.extractHd({
-        inputFilename: inputChdFilename,
-        outputFilename,
-      });
-      return outputFilename;
-    }
-
-    if (metadataTags.has('CHCD') || metadataTags.has('CHTR') || metadataTags.has('CHT2')) {
-      // CD-ROMs
-      const outputCue = `${outputFilename}.cue`;
-      const outputBin = `${outputFilename}.bin`;
-      await this.extractCd({
-        inputFilename: inputChdFilename,
-        outputFilename: outputCue,
-        outputBinFilename: outputBin,
-      });
-      return outputCue;
-    }
-    if (metadataTags.has('CHGT') || metadataTags.has('CHGD')) {
-      // Dreamcast GD-ROM
-      const outputGdi = `${outputFilename}.gdi`;
-      await this.extractCd({
-        inputFilename: inputChdFilename,
-        outputFilename: outputGdi,
-      });
-      return outputGdi;
-    }
-
-    throw new Error('couldn\'t automatically detect CHD data type');
-  },
-
   // TODO(cemmer): extractraw
   extractHd: ChdmanHd.extractHd,
   extractCd: ChdmanCd.extractCd,
-  // TODO(cemmer): extractdvd
+  extractDvd: ChdmanDvd.extractDvd,
   // TODO(cemmer): extractld
 
   // TODO(cemmer): copy
diff --git a/src/chdman/chdmanDvd.ts b/src/chdman/chdmanDvd.ts
new file mode 100644
index 0000000..17d8bbf
--- /dev/null
+++ b/src/chdman/chdmanDvd.ts
@@ -0,0 +1,63 @@
+import util from 'node:util';
+import fs from 'node:fs';
+import ChdmanBin from './chdmanBin.js';
+import { CompressionAlgorithm } from './common.js';
+
+export interface CreateDvdOptions {
+  outputFilename: string,
+  outputParentFilename?: string,
+  force?: boolean,
+  inputFilename: string,
+  compression?: 'none' | CompressionAlgorithm[],
+  numProcessors?: number
+}
+
+export interface ExtractDvdOptions {
+  outputFilename: string,
+  outputBinFilename?: string,
+  force?: boolean,
+  inputFilename: string,
+  inputParentFilename?: string,
+}
+
+export default {
+  /**
+   * Create a DVD CHD.
+   */
+  async createDvd(options: CreateDvdOptions): Promise<void> {
+    const existedBefore = await util.promisify(fs.exists)(options.outputFilename);
+    try {
+      await ChdmanBin.run([
+        'createdvd',
+        '--output', options.outputFilename,
+        ...(options.outputParentFilename ? ['--outputparent', String(options.outputParentFilename)] : []),
+        ...(options.force === true ? ['--force'] : []),
+        '--input', options.inputFilename,
+        ...(options.compression === undefined
+          ? []
+          : ['--compression', Array.isArray(options.compression) ? options.compression.join(',') : options.compression]),
+        ...(options.numProcessors === undefined ? [] : ['--numprocessors', String(options.numProcessors)]),
+      ]);
+    } catch (error) {
+      // chdman can leave cruft when it fails
+      if (!existedBefore) {
+        await util.promisify(fs.rm)(options.outputFilename, { force: true });
+      }
+      throw error;
+    }
+  },
+
+  /**
+   * Extract a DVD CHD.
+   */
+  async extractDvd(options: ExtractDvdOptions): Promise<void> {
+    await ChdmanBin.run([
+      'extractdvd',
+      '--output', options.outputFilename,
+      ...(options.outputBinFilename ? ['--outputbin', options.outputBinFilename] : []),
+      ...(options.force === true ? ['--force'] : []),
+      '--input', options.inputFilename,
+      ...(options.inputParentFilename ? ['--inputparent', options.inputParentFilename] : []),
+    ]);
+  },
+};
diff --git a/test/chdman/chdmanDvd.test.ts b/test/chdman/chdmanDvd.test.ts
new file mode 100644
index 0000000..7ffa69b
--- /dev/null
+++ b/test/chdman/chdmanDvd.test.ts
@@ -0,0 +1,73 @@
+import path from 'node:path';
+import os from 'node:os';
+import util from 'node:util';
+import fs from 'node:fs';
+import crypto from 'node:crypto';
+import ChdmanInfo from '../../src/chdman/chdmanInfo.js';
+import TestUtil from '../testUtil.js';
+import ChdmanDvd from '../../src/chdman/chdmanDvd.js';
+
+// https://unix.stackexchange.com/a/33634
+
+test('should fail on nonexistent file', async () => {
+  const temporaryChd = `${await TestUtil.mktemp(path.join(os.tmpdir(), 'dummy'))}.chd`;
+  const temporaryIso = `${await TestUtil.mktemp(path.join(os.tmpdir(), 'dummy'))}.iso`;
+
+  try {
+    await expect(ChdmanDvd.createDvd({
+      inputFilename: os.devNull,
+      outputFilename: temporaryChd,
+    })).rejects.toBeDefined();
+    await expect(ChdmanInfo.info({
+      inputFilename: temporaryIso,
+    })).rejects.toBeDefined();
+    await expect(ChdmanDvd.createDvd({
+      inputFilename: temporaryChd,
+      outputFilename: temporaryIso,
+    })).rejects.toBeDefined();
+  } finally {
+    await util.promisify(fs.rm)(temporaryChd, { force: true });
+  }
+});
+
+test.each([
+  [path.join('test', 'fixtures', 'iso', '2048.iso')],
+  [path.join('test', 'fixtures', 'iso', '16384.iso')],
+])('should create, info, and extract: %s', async (iso) => {
+  const temporaryChd = `${await TestUtil.mktemp(path.join(os.tmpdir(), path.basename(iso)))}.chd`;
+  const temporaryIso = `${await TestUtil.mktemp(path.join(os.tmpdir(), 'dummy'))}.hd`;
+
+  try {
+    await ChdmanDvd.createDvd({
+      inputFilename: iso,
+      outputFilename: temporaryChd,
+    });
+    await expect(TestUtil.exists(temporaryChd)).resolves.toEqual(true);
+
+    const info = await ChdmanInfo.info({
+      inputFilename: temporaryChd,
+    });
+    expect(info.fileVersion).toBeGreaterThan(0);
+    expect(info.logicalSize).toBeGreaterThan(0);
+    expect(info.hunkSize).toBeGreaterThan(0);
+    expect(info.totalHunks).toBeGreaterThan(0);
+    expect(info.unitSize).toBeGreaterThan(0);
+    expect(info.totalUnits).toBeGreaterThan(0);
+    expect(info.compression.length).toBeGreaterThan(0);
+    expect(info.chdSize).toBeGreaterThan(0);
+    expect(info.ratio).toBeGreaterThan(0);
+    expect(info.sha1).toBeTruthy();
+    expect(info.dataSha1).toBeTruthy();
+
+    await ChdmanDvd.extractDvd({
+      inputFilename: temporaryChd,
+      outputFilename: temporaryIso,
+    });
+    await expect(TestUtil.exists(temporaryIso)).resolves.toEqual(true);
+    expect(crypto.createHash('sha1').update(await util.promisify(fs.readFile)(iso)).digest('hex'))
+      .toEqual(crypto.createHash('sha1').update(await util.promisify(fs.readFile)(temporaryIso)).digest('hex'));
+  } finally {
+    await util.promisify(fs.rm)(temporaryChd, { force: true });
+    await util.promisify(fs.rm)(temporaryIso, { force: true });
+  }
+});
diff --git a/test/chdman/chdmanHd.test.ts b/test/chdman/chdmanHd.test.ts
index 5b5ba60..965471d 100644
--- a/test/chdman/chdmanHd.test.ts
+++ b/test/chdman/chdmanHd.test.ts
@@ -30,8 +30,9 @@ test('should fail on nonexistent file', async () => {
 });
 
 test.each([
-  [path.join('test', 'fixtures', 'cue', 'small.hd'), Math.ceil(512 / 2048) * 2048],
-  [path.join('test', 'fixtures', 'cue', 'large.hd'), Math.ceil(3584 / 2048) * 2048],
+  [path.join('test', 'fixtures', 'hd', '512.hd'), Math.ceil(512 / 2048) * 2048],
+  [path.join('test', 'fixtures', 'hd', '3584.hd'), Math.ceil(3584 / 2048) * 2048],
+  [path.join('test', 'fixtures', 'iso', '2048.iso'), 2048],
 ])('should create, info, and extract: %s', async (hd, expectedBinSize) => {
   const temporaryChd = `${await TestUtil.mktemp(path.join(os.tmpdir(), path.basename(hd)))}.chd`;
   const temporaryHd = `${await TestUtil.mktemp(path.join(os.tmpdir(), 'dummy'))}.hd`;
diff --git a/test/fixtures/cue/large.hd b/test/fixtures/hd/3584.hd
similarity index 100%
rename from test/fixtures/cue/large.hd
rename to test/fixtures/hd/3584.hd
diff --git a/test/fixtures/cue/small.hd b/test/fixtures/hd/512.hd
similarity index 100%
rename from test/fixtures/cue/small.hd
rename to test/fixtures/hd/512.hd
diff --git a/test/fixtures/iso/16384.chd.iso b/test/fixtures/iso/16384.chd.iso
new file mode 100644
index 0000000..a4aba7a
Binary files /dev/null and b/test/fixtures/iso/16384.chd.iso differ
diff --git a/test/fixtures/iso/16384.iso b/test/fixtures/iso/16384.iso
new file mode 100644
index 0000000..a4aba7a
Binary files /dev/null and b/test/fixtures/iso/16384.iso differ
diff --git a/test/fixtures/iso/2048.iso b/test/fixtures/iso/2048.iso
new file mode 100644
index 0000000..3383e58
Binary files /dev/null and b/test/fixtures/iso/2048.iso differ