Win7下，折腾Node.js过程中，运行服务器，其中内部调用相关代码：
function show(response) { console.log("Request handler 'show' was called."); fs.readFile("/tmp/test.png", "binary", function(error, file) if(error) { response.writeHead(500, {"Content-Type": "text/plain"}); response.write(error + "\n"); response.end(); } else { response.writeHead(200, {"Content-Type": "image/png"}); response.write(file, "binary"); response.end(); } });}去重命名，结果出错：
D:\tmp\tmp_dev_root\node.js>D:\tmp\tmp_dev_root\node.js>node index.jsServer has started.Reforst for /upload received.About to route a reforst for /uploadRequest ha'upload'pload' was called.about to parsepadoneg donefs.js:returnreturn binding.rename(pathModule._makeLong(oldPath), ^Error: EXDEV, cross-device link not perm'C:\Users\CLi\AppData\Local\Temp\df99513a93a1cbfbc26e076f08b92' at Object.fs.renameSync (fs.js:439:18) at D:\tmp\tmp_dev_root\node.js\requestHandlers.js:34:8 at IncomingForm.parse (D:\tmp\tmp_dev_root\node.js\node_modules\formidable\lib\incoming_form.js:121:9) at IncomingForm.EventEmitter.emit (events.js:93:17) at IncomingForm._maybeEnd (D:\tmp\tmp_dev_root\node.js\node_modules\formidable\lib\incoming_form.js:383:8) at IncomingForm.handlePart (D:\tmp\tmp_dev_root\node.js\node_modules\formidable\lib\incoming_form.js:212:12) at File.end (D:\tmp\tmp_dev_root\node.js\node_modules\formidablfileb\file.js:71:5) at WriteStream.flush (fs.js:1515:9) at Object.oncomplete (fs.js:297:15)【解决过程】
1.参考：
Node.JS fs.rename doesn’t work
How do I move file a to a different partition in Node.js?
去试试代码：
var fs = require("fs"), util = require('util'); ...//fs.renameSync(files.upload.path, "/tmp/test.png"); var readStream = fs.createReadStream(files.upload.path)var writeStream = fs.createWriteStream("/tmp/test.png"); util.pump(readStream, writeStream, function() { fs.unlinkSync(files.upload.path);});最后，就可以实现跨分区重命名文件的功能了。
【总结】
是跨分区重命名文件，会有权限问题。
其中此处使用的方案是，先从源文件拷贝到另外分区的目标文件，然后再unlink，就可以了。