DLA：direct letter access
用来改进在光盘上复制和删除文件的，用thaikpad的software installer能找到一个叫DLA by SONIC的补丁，就是这个东西在搞鬼了
右击你的光驱图标，在属性页里应该有一个enable DLA的选项，把那个勾去掉就可以了，我现在没有光驱，没法上图
补充：
DLA 是目前为止最为流行的刻录软件包，因为它曾经是（目前依然是）可以为绝大部分CD，DVD刻录光驱，利用的免费软件。DLA最初是由Veritas的软件工程师编写，于2002年卖给Sonic Solutions。到目前为止，Veritas 和 Sonic Solutions 根据不同的OEM协议，发布了许多用户版本给不同的OEM制造商。现在大多数CD/DVD刻录机品牌，无论是零售还是OEM，都习惯把用户版本的DLA当作补充软件安装在用户的硬盘上。例如，目前有IBM， HP，和Sony等不同的版本。当然还有更多。所有的变动实际上都是建立在源代码上的，从技术上与最初的DLA没有多少区别。Sonic Solutions 的DLA用户版本是作为49美元的CD/DVD刻录软件的一部分。
DLA可以在Windows 98，ME，NT，2000，XP下用你的CD/DVD光驱直接读取/刻录。你可以使用你的CD-RW或DVD刻录设备作为文件存储器，和像硬盘或软盘一样检索文件。不过光盘必须被格式化，而且能被DLA使用。Drive Letter Access (DLA)是一个能让你自由的在硬盘和光盘之间拖放文件，和像软盘一样使用的方便无价公共软件。
原文
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DLA is by far the most popular packet writing software, partly because it once was (and still is) available for free with many CD and DVD recording drives. DLA had been originally programmed by Veritas software engineers, and later sold to Sonic Solutions in 2002. Up to the present, both Veritas and Sonic Solutions have released a lot of custom versions of DLA to various OEM manufacturers under various OEM agreements. Most of the branded CD/DVD recording drives, both retail and OEM, now come with their custom version of DLA as a supplemental software on the driver disk. For example, there are HP, IBM, and Sony versions available. Undoubtedly, there are more. All the variations are actually built on the same codebase and technically have very little difference from the original DLA. Sonic Solutions itself sells the original DLA as a part of their $49 CD/DVD recording package.
DLA enables direct read/write drive letter access to your CD/DVD optical drive from Windows 98, ME, NT, 2000, and XP. You can now use your CD-RW or DVD recorder for file storage and retrieval as if it were a hard drive or floppy disk. Discs must be formatted for DLA use. Drive Letter Access (DLA) is an invaluable utility that lets you drag and drop files from your hard drive to your CD or DVD recorder as easily as you would to a floppy disk.
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