闪存驱动器_“空”和新格式化的闪存驱动器上如何有可用空间？
闪存驱动器
When you delete everything from a flash drive and reformat it, you would think it should ‘display’ as completely empty when checked, but that may not always be the case. With that in mind, today’s SuperUser Q&A post has the answer to a confused reader’s question.
当您从闪存驱动器中删除所有内容并将其重新格式化时，您会认为它在被选中时应“显示”为完全空白，但并非总是如此。 考虑到这一点，今天的SuperUser Q＆A帖子回答了一个困惑的读者的问题。
Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites.
今天的“问答”环节由SuperUser提供，它是Stack Exchange的一个分支，该社区是由社区驱动的Q＆A网站分组。
Photo courtesy of Adikos (Flickr).
图片由Adikos(Flickr)提供 。
问题 (The Question)
SuperUser reader Andrew wants to know how there can be used space on an empty and freshly formatted flash drive:
超级用户阅读器安德鲁(Andrew)想知道如何在空的和新格式化的闪存驱动器上使用空间：
I recently purchased a SanDisk Cruzer CZ36 16GB USB 2.0 flash drive with FAT32 as the default formatting. I need to store files that are larger than four GB on this flash drive, so I decided to reformat the flash drive as NTFS. The flash drive also had some SanDisk SecureAccess software preloaded on it that I did not want. On my Windows 7 system, I right-clicked on the flash drive in Windows Explorer and selected Format. I did a full format by deselecting the Quick Format option.
我最近购买了SanDisk Cruzer CZ36 16GB USB 2.0闪存驱动器，其默认格式为FAT32。 我需要在此闪存驱动器上存储大于4 GB的文件，因此我决定将闪存驱动器重新格式化为NTFS。 闪存驱动器上还预装了一些我不需要的SanDisk SecureAccess软件。 在Windows 7系统上，我右键单击Windows资源管理器中的闪存驱动器，然后选择格式 。 我通过取消选择“ 快速格式化”选项进行了完整格式化。
After reformatting the flash drive, Windows tells me that it is not completely empty. If I right-click on the flash drive in Windows Explorer and select Properties, Windows gives me this information:
重新格式化闪存驱动器后，Windows告诉我它不是完全空的。 如果我右键单击Windows资源管理器中的闪存驱动器，然后选择属性 ，则Windows将为我提供以下信息：
Why is this the case even though I just formatted the flash drive? Is this to be expected or are there some files still lingering on the flash drive? When I open the flash drive in Windows Explorer, no folders or files appear even though my system’s settings are configured to show hidden items. I find it worrisome that there is a total of 91.7 MB somehow being used on this supposedly “empty” flash drive.
即使我刚刚格式化了闪存驱动器，为什么会这样？ 这是预料之中的还是闪存驱动器上仍有一些文件残留？ 当我在Windows资源管理器中打开闪存驱动器时，即使我的系统设置配置为显示隐藏项目，也不会显示任何文件夹或文件。 我发现令人担忧的是，在这个所谓的“空”闪存驱动器上总共使用了91.7 MB。
How can there be used space on an empty and freshly formatted flash drive?
空的和新格式化的闪存驱动器上如何有可用空间？
答案 (The Answer)
SuperUser contributor David Schwartz has the answer for us:
超级用户贡献者David Schwartz为我们提供了答案：
This is normal. An “empty” NTFS file system has a number of internal files such as the master file table (“$MFT”), the log file used for file system recovery (“$LogFile”), the volume descriptor file (“$Volume”), and so on.
这个是正常的。 “空” NTFS文件系统具有许多内部文件，例如主文件表(“ $ MFT”)，用于文件系统恢复的日志文件(“ $ LogFile”)，卷描述符文件(“ $ Volume”)。 )， 等等。
The largest one is probably the cluster allocation bitmap (“$Bitmap”) that keeps track of the space that is used and the space that is free. This is pre-allocated when the file system is created.
最大的可能是群集分配位图(“ $ Bitmap”)，该位图可跟踪已用空间和可用空间。 创建文件系统时已预先分配了该资源。
Have something to add to the explanation? Sound off in the comments. Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here.
有什么补充说明吗？ 在评论中听起来不错。 是否想从其他精通Stack Exchange的用户那里获得更多答案？ 在此处查看完整的讨论线程 。
闪存驱动器