diff --git a/Makefile b/Makefile
index 7c9ee57..3b153fc 100644
--- a/Makefile
+++ b/Makefile
@@ -231,13 +231,14 @@ fs: $(UPROGS)
 		sudo cp $$file $(dst)/bin/$${file#$U/_}; done
 	@sudo umount $(dst)
 
-# Write sdcard
-sdcard: fs
-	@if [ "$(sd)" != "" ]; then \
-		echo "flashing into sd card..."; \
-		sudo dd if=fs.img of=$(sd); \
-	else \
-		echo "sd card not detected!"; fi
+# Write mounted sdcard
+sdcard: userprogs
+	@if [ ! -d "$(dst)/bin" ]; then sudo mkdir $(dst)/bin; fi
+	@for file in $$( ls $U/_* ); do \
+		sudo cp $$file $(dst)/bin/$${file#$U/_}; done
+	@sudo cp $U/_init $(dst)/init
+	@sudo cp $U/_sh $(dst)/sh
+	@sudo cp README $(dst)/README
 
 clean: 
 	rm -f *.tex *.dvi *.idx *.aux *.log *.ind *.ilg \
diff --git a/README.md b/README.md
index 7d392c6..4e1803f 100644
--- a/README.md
+++ b/README.md
@@ -24,36 +24,31 @@ Run xv6-riscv on k210 board
 git clone https://github.com/HUST-OS/xv6-k210
 ```
 
-## Build
+## Run on k210 board
 First you need to connect your k210 board to your PC.  
-And check the `USB serial port`:  
+And check the `USB serial port` (In my situation it will be `ttyUSB0`):  
 ```bash
 ls /dev/ | grep USB
 ```
-In my situation it will be `ttyUSB0`  
+Build the kernel and user program:
 
 ```bash
 cd xv6-k210
 make build
 ```
-
-## Run on k210 board
 Instead of the original file system, xv6-k210 runs with FAT32. You might need an SD card with FAT32 format.  
-To start `shell`, you need to rename the "_init" and "_sh" in the "/xv6-user" to "init" and "sh" after building, 
-then copy them to the root of your SD card.  
-Also, you can copy other programs start with "\_". 
-Or you can directly run the command as below with your SD card connected to your PC (SD card reader required).
-
-Warning: this will format your SD card and clean your original data!
+Your SD card should NOT keep a partition table. To start `shell` and other user programs, you need to copy them into your SD card.  
+First, connect and mount your SD card (SD card reader required).
 ```bash
-make sdcard sd="your SD card device's path"
+ls /dev/ # To check your SD device
+mount <your SD device name> <mount point>
+make sdcard dst="SD card mount point"
+umount <mount point>
 ```
-
-To run on k210:
+Then, insert the SD card to your k210 board and run:
 ```bash
 make run
 ```
-
 Sometimes you should change the `USB serial port`:  
 ```bash
 make run k210-serialport=`Your-USB-port`(default by ttyUSB0)
diff --git a/README_cn.md b/README_cn.md
index 30c6f59..6ed9df2 100644
--- a/README_cn.md
+++ b/README_cn.md
@@ -24,30 +24,29 @@
 git clone https://github.com/HUST-OS/xv6-k210
 ```
 
-## 编译
+## <a id="title_k210">在 k210 开发板上运行</a>
 首先您需要连接 `k210` 开发板到电脑，然后检查 USB 端口：  
 ```bash
 ls /dev/ | grep USB
 ```
 在我的机器上的情况是将会显示 `ttyUSB0`，这就是 USB 端口。  
-然后运行以下命令：    
+然后运行以下命令，以编译内核和用户程序：    
 
 ```bash
 cd xv6-k210
 make build
 ```
 
-## <a id="title_k210">在 k210 开发板上运行</a>
-Xv6-k210 采用 FAT32 文件系统，而不是其原本的文件系统。您需要一张 FAT32 格式的 SD 卡才能运行。
-在编译项目后，您需要将 “/xv6-user” 目录下的 “_init” 和 “_sh” 重命名为 “init” 和 “sh”，并拷贝至 SD 卡的根目录下。您还可以拷贝其他编译好的程序(以“\_”开头的文件)。
-或者，您可以将 SD 卡连至主机（需要读卡器），再直接运行以下命令。
-
-警告：这会格式化您的 SD 卡并清除卡上的原有数据！
+Xv6-k210 采用 FAT32 文件系统，而不是其原本的文件系统。您需要一张 FAT32 格式的 SD 卡才能运行。并且 SD 卡上不能有分区表。  
+为了能启动 `shell` 和其他用户程序，您需要将它们拷贝至 SD 卡中。
+首先，需要将 SD 卡连至主机（需要读卡器）并进行挂载。
 ```bash
-make sdcard sd="your SD card device's path"
+ls /dev/ # 确认您的 SD 卡设备名
+mount <SD 卡设备名> <挂载点>
+make sdcard dst="挂载点"
+umount <挂载点>
 ```
-
-运行以下命令以在 `k210` 上运行：  
+然后，将 SD 卡接入 `k210` 并运行：  
 ```bash
 make run
 ```
@@ -117,5 +116,5 @@ Shell 命令其实也是用户程序。这些程序应当放置在 SD 卡或 `fs
 - [X] 稳定的键盘输入（k210）
 
 ## TODO
-解决用户态导致 RUSTSBI 报 panic 的 bug 
+解决用户态由于未知原因导致 panic 的 bug