diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..b943dbc
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "deno.enable": true
+}
\ No newline at end of file
diff --git a/dev.ts b/dev.ts
index 8885505..61d40ba 100644
--- a/dev.ts
+++ b/dev.ts
@@ -6,7 +6,7 @@ const testPath = "./test.txt";
 const writeResult = await sequentialWriteTest(
   {
     filePath: testPath,
-    sizeInMB: 1000,
+    sizeInMB: 200,
     rounds: 10,
     bufferSizeMB: 1,
     keepTheFile: true,
diff --git a/speedtest/lib.ts b/speedtest/lib.ts
index 803b1c4..78182e6 100644
--- a/speedtest/lib.ts
+++ b/speedtest/lib.ts
@@ -65,14 +65,16 @@ export async function sequentialReadTest(
 ): Promise<Progress> {
   const { filePath, rounds, deleteAfter } = options;
   const file = await Deno.open(filePath, { read: true });
-  const buffer = new Uint8Array(oneMB); // 1MB buffer
+  const reader = file.readable.getReader();
   const start = performance.now();
   let totalMB = 0;
-  while ((await file.read(buffer)) !== null) {
-    totalMB += 1;
+
+  let readResult;
+  while (!(readResult = await reader.read()).done) {
+    totalMB += readResult.value.length / oneMB;
   }
   const totalDuration = (performance.now() - start) / 1000;
-  file.close();
+  // file.close();
   if (options.deleteAfter) {
     Deno.removeSync(filePath);
   }
diff --git a/src/lib/store.ts b/src/lib/store.ts
index 0c0acf9..31ef91f 100644
--- a/src/lib/store.ts
+++ b/src/lib/store.ts
@@ -1,4 +1,4 @@
 import { writable } from "svelte/store";
 
 export const stress = writable(1);
-export const targetDir = writable<string | undefined>(undefined);
+export const targetDir = writable<string | undefined>("/Users/kunkun/Desktop");