移动硬盘插好后，提示发现新硬件，但是却在电脑中找不到硬盘显示
推荐回答（4个）
在xp系统中找不到U盘盘符
1.系统目录 C:\WINDOWS\system32\drivers 查找 sptd.sys 的文件。删除它，重新启动。问题解决！注意：这个sptd.sys不是微软Windows自带的。（可能是安装Daemon Tools装上的）
2.1. 系统里有映射的网络驱动器。导致该盘符不能分配给U盘.
解决办法：断开映射的网络驱动器.
3.盘符被隐藏。
解决办法：进入注册表(regedit.exe)，进入“HEKY-CURRENT-USER\Software\microsoft\windows\currentversion\policies\explorer"分支。找到该路径存在的键值“NOdrives”，将其删除。注销然后重新登陆。 (不是 NoDriveTypeAutoRun 键值).
4.U盘不格式不正确
一般的U盘是使用HD（硬盘FAT16）格式，如果使用U盘启动程序更改，可能U盘格式不正确。请使用PQ、PPM等硬盘分区软件重新分区；
5.usb移动存储设备被禁用
请保证：
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbehci]
"start"=dword:00000004
6.U盘出问题。
解决办法：重新格式化U盘。最好低级格式化，到网上找一个U盘工具。
实在不行，那就最后一招：重新干净安装Windows XP!
7.解决办法：右击“我的电脑”，在弹出的快捷菜单中选择“管理”命令，进入到“计算机管理”窗口，依次展开“存储/可移动存储”，单击“磁盘管理”一项，在窗口右侧，看到U盘运行状态为“良好”，这说明U盘没问题。右击该窗口中的U盘盘符，选择其快捷菜单的“更改驱动器名和路径”命令，在出现的对话框中，点击〔更改〕按钮，为其选择一个未被使用的盘符。确定之后退出。重新打开“我的电脑”，久违的U盘盘符出现了。
还有两种可能！
第一。权限问题，您不是管理员用户（极有可能）
第二。服务及组策略里未开启！
还有一种方法针对两者：打开Internet图标，然后在地址栏里打开我的电脑就能看见找到的盘符了。
右键点击“我的电脑”，选择“管理”，选择“磁盘管理”，你会看到你的电脑里面多了一块硬盘，右键点击这块硬盘，选择“更改驱动器号和路径”，点“添加”，给你的硬盘添加一个盘符，确定就可以了。。。
可能有一个原因，我的电脑--右键--管理--磁盘管理---看看又没你的移动硬盘，如果有的话，给移动硬盘的分区分配个驱动器号。。还有可能你的分区类型不是windows支持的。或者硬件没有安装成功。在任务栏没有那个绿色的标志
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