diff --git a/apps/cli/src/builder/docker.ts b/apps/cli/src/builder/docker.ts
index faa2238b..03595756 100644
--- a/apps/cli/src/builder/docker.ts
+++ b/apps/cli/src/builder/docker.ts
@@ -98,7 +98,7 @@ export const build = async (
     drive: DockerDriveConfig,
     sdkImage: string,
     destination: string,
-): Promise<void> => {
+): Promise<ImageInfo | undefined> => {
     const { format } = drive;
 
     const ocitar = `${name}.oci.tar`;
@@ -153,7 +153,9 @@ export const build = async (
         }
     } finally {
         // delete intermediate files
-        await fs.remove(path.join(destination, ocitar));
-        await fs.remove(path.join(destination, tar));
+        // await fs.remove(path.join(destination, ocitar));
+        // await fs.remove(path.join(destination, tar));
     }
+
+    return imageInfo;
 };
diff --git a/apps/cli/src/builder/index.ts b/apps/cli/src/builder/index.ts
index 0a36754d..659946f2 100644
--- a/apps/cli/src/builder/index.ts
+++ b/apps/cli/src/builder/index.ts
@@ -22,12 +22,11 @@ export const tarToExt = async (
         "--block-size",
         blockSize.toString(),
         "--faketime",
-        "--root",
-        output,
         "--readjustment",
         adjustment.toString(),
         "--tarball",
         input,
+        output,
     ];
     return execaDockerFallback(command, args, options);
 };
diff --git a/apps/cli/src/commands/build.ts b/apps/cli/src/commands/build.ts
index 046ea38e..f7319d35 100644
--- a/apps/cli/src/commands/build.ts
+++ b/apps/cli/src/commands/build.ts
@@ -20,19 +20,14 @@ type ImageInfo = {
     workdir: string;
 };
 
-type DriveResult_ = {
-    filename: string;
-    imageInfo?: ImageInfo;
-};
-
-type DriveResult = void;
+type DriveResult = ImageInfo | undefined | void;
 
 const buildDrive = async (
     name: string,
     drive: DriveConfig,
     sdkImage: string,
     destination: string,
-): Promise<void> => {
+): Promise<DriveResult> => {
     switch (drive.builder) {
         case "directory": {
             return buildDirectory(name, drive, sdkImage, destination);
@@ -184,8 +179,7 @@ export default class Build extends BaseCommand<typeof Build> {
 
         // get image info of root drive
         const root = await results["root"];
-        // const imageInfo = root.imageInfo;
-        const imageInfo = undefined;
+        const imageInfo = root || undefined;
 
         // path of machine snapshot
         const snapshotPath = this.getContextPath("image");
diff --git a/apps/cli/src/config.ts b/apps/cli/src/config.ts
index 1e062647..7e5e4393 100644
--- a/apps/cli/src/config.ts
+++ b/apps/cli/src/config.ts
@@ -1,4 +1,5 @@
 import bytes from "bytes";
+import os from "os";
 import { extname } from "path";
 import { TomlPrimitive, parse as parseToml } from "smol-toml";
 
@@ -7,7 +8,10 @@ import { TomlPrimitive, parse as parseToml } from "smol-toml";
  */
 const DEFAULT_FORMAT = "ext2";
 const DEFAULT_RAM = "128Mi";
-const DEFAULT_RAM_IMAGE = "/usr/share/cartesi-machine/images/linux.bin";
+const DEFAULT_RAM_IMAGE_DOCKER = "/usr/share/cartesi-machine/images/linux.bin";
+const DEFAULT_RAM_IMAGE_LINUX = "/usr/share/cartesi-machine/images/linux.bin";
+const DEFAULT_RAM_IMAGE_MAC =
+    "/opt/homebrew/share/cartesi-machine/images/linux.bin";
 const DEFAULT_SDK = "cartesi/sdk:0.10.0";
 
 type Builder = "directory" | "docker" | "empty" | "none" | "tar";
@@ -87,6 +91,15 @@ export const defaultRootDriveConfig = (): DriveConfig => ({
     tags: [],
 });
 
+export const defaultRamImage = (): string => {
+    switch (os.platform()) {
+        case "darwin":
+            return DEFAULT_RAM_IMAGE_MAC;
+        default:
+            return DEFAULT_RAM_IMAGE_LINUX;
+    }
+};
+
 export const defaultMachineConfig = (): MachineConfig => ({
     assertRollingTemplate: undefined,
     bootargs: [],
@@ -94,7 +107,7 @@ export const defaultMachineConfig = (): MachineConfig => ({
     maxMCycle: undefined,
     noRollup: undefined,
     ramLength: DEFAULT_RAM,
-    ramImage: DEFAULT_RAM_IMAGE,
+    ramImage: defaultRamImage(),
 });
 
 export const defaultConfig = (): Config => ({
@@ -265,7 +278,7 @@ const parseMachine = (value: TomlPrimitive): MachineConfig => {
         maxMCycle: parseOptionalNumber(toml["max-mcycle"]),
         noRollup: parseBoolean(toml["no-rollup"], false),
         ramLength: parseString(toml["ram-length"], DEFAULT_RAM),
-        ramImage: parseString(toml["ram-image"], DEFAULT_RAM_IMAGE),
+        ramImage: parseString(toml["ram-image"], defaultRamImage()),
     };
 };