diff --git a/README.md b/README.md
index 3804742..a506c0f 100644
--- a/README.md
+++ b/README.md
@@ -5,5 +5,5 @@
 
 ![](https://i.imgur.com/8ISVrRe.png)
 
-This extension's read speed is not accurate. Your OS may cache the test data and result in a much higher speed.
+This extension's read speed is not accurate. Your OS may cache the test data and result in a much higher or lower speed.
 Will be fixed in the future.
diff --git a/dev.ts b/dev.ts
index 61d40ba..3c63ba2 100644
--- a/dev.ts
+++ b/dev.ts
@@ -6,22 +6,28 @@ const testPath = "./test.txt";
 const writeResult = await sequentialWriteTest(
   {
     filePath: testPath,
-    sizeInMB: 200,
-    rounds: 10,
+    sizeInMB: 1000,
+    rounds: 5,
     bufferSizeMB: 1,
     keepTheFile: true,
   },
   (progress) => {
-    console.log(progress);
+    console.log("Write progress:", progress);
   }
 );
-console.log(writeResult);
-console.log(writeResult.totalMB / writeResult.totalDuration);
+console.log("Write result:", writeResult);
+console.log(
+  "Write speed (MB/s):",
+  writeResult.totalMB / writeResult.totalDuration
+);
 
 const readResult = await sequentialReadTest({
   filePath: testPath,
   rounds: 3,
   deleteAfter: false,
 });
-console.log(readResult);
-console.log("read speed: ", readResult.totalMB / readResult.totalDuration);
+console.log("Read result:", readResult);
+console.log(
+  "Read speed (MB/s):",
+  readResult.totalMB / readResult.totalDuration
+);
diff --git a/package.json b/package.json
index dfa60d7..0541303 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "name": "kunkun-ext-disk-speed",
   "license": "MIT",
   "repository": "https://github.com/kunkunsh/kunkun-ext-disk-speed",
-  "version": "0.0.8",
+  "version": "0.0.9",
   "type": "module",
   "kunkun": {
     "name": "Disk Speed",
diff --git a/speedtest/lib.ts b/speedtest/lib.ts
index 78182e6..89bc4ad 100644
--- a/speedtest/lib.ts
+++ b/speedtest/lib.ts
@@ -64,18 +64,25 @@ export async function sequentialReadTest(
   }
 ): Promise<Progress> {
   const { filePath, rounds, deleteAfter } = options;
-  const file = await Deno.open(filePath, { read: true });
-  const reader = file.readable.getReader();
-  const start = performance.now();
   let totalMB = 0;
+  let totalDuration = 0;
 
-  let readResult;
-  while (!(readResult = await reader.read()).done) {
-    totalMB += readResult.value.length / oneMB;
+  for (let round = 0; round < rounds; round++) {
+    const file = await Deno.open(filePath, { read: true });
+    const reader = file.readable.getReader();
+    const start = performance.now();
+
+    let readResult;
+    while (!(readResult = await reader.read()).done) {
+      totalMB += readResult.value.length / oneMB;
+    }
+    const roundDuration = (performance.now() - start) / 1000;
+    totalDuration += roundDuration;
+
+    await reader.releaseLock();
   }
-  const totalDuration = (performance.now() - start) / 1000;
-  // file.close();
-  if (options.deleteAfter) {
+
+  if (deleteAfter) {
     Deno.removeSync(filePath);
   }
   return { totalMB, totalDuration };
diff --git a/src/App.svelte b/src/App.svelte
index 0255841..46e49f1 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -128,7 +128,7 @@
     </Button>
     <small class="text-gray-500">
       This extension's read speed may be inaccurate. Your OS may cache the test
-      data and result in a much higher speed. Will be fixed in the future.
+      data and result in a higher or lower speed. Will be fixed in the future.
     </small>
     <div class="grid h-96 w-full grid-cols-2">
       <SpeedGauge
diff --git a/src/lib/store.ts b/src/lib/store.ts
index 31ef91f..4789c4a 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>("/Users/kunkun/Desktop");
+export const targetDir = writable<string | undefined>("/Volumes/Portable2TB");