缓冲区缓存会缓存文件系统和相关块设备之间的请求。
The buffer cache buffers requests between the file systems and the block devices that they manipulate.
实际上，如果您想访问一个特定的块设备(如磁盘、分区、光盘驱动器等等)，事实上有几个不同的特殊文件可以引用。
In fact, when you want to access a particular block device (such as a disks, partition, CD-ROM drive, etc) you'll actually have several different special files to which you can refer.
根目录条目(dentry)对象也缓存在这里，因为它是文件系统所在的块设备。
The root directory entry (dentry) object is cached here also, as is the block device on which this file system resides.
因为Ceph客户实现CRUSH，而且对磁盘上的文件映射块一无所知，下面的存储设备就能安全地管理对象到块的映射。
Because the Ceph clients implement CRUSH and do not have knowledge of the block mapping of files on the disks, the underlying storage devices can safely manage the mapping of objects to blocks.
IDS允许将裸设备或者熟文件用于dbspace块。
IDS allows you to use either raw devices or cooked files for dbspace chunks.
从存储角度来看，Ceph对象存储设备执行从对象到块的映射(在客户端的文件系统层中常常执行的任务)。
From a storage perspective, Ceph object storage devices perform the mapping of objects to blocks (a task traditionally done at the file system layer in the client).
主机操作系统不再需要考虑块到文件的映射，存储设备本身会提供这种映射，因此主机可以在文件级进行操作。
Rather than the host operating system needing to worry about block-to-file mapping, the storage device itself provides this mapping, allowing the host to operate at the file level.
除了从底层文件系统抽象文件操作的细节之外，VFS还将底层块设备绑定到可用的文件系统。
In addition to abstracting the details of file operations from the underlying file systems, VFS ties the underlying block devices to the available file systems.
由于MTD_BLOCK设备提供象块设备那样的模拟，通常更可取的是在这个模拟基础上创建象FTL和JFFS2那样的文件系统。
Since MTD_BLOCK devices provide block-device-like emulation, it is often preferable to create filesystems like FTL and JFFS2 on top of this emulation.
MTD_CHAR提供对闪存的原始字符访问，而MTD_BLOCK将闪存设计为可以在上面创建文件系统的常规块设备(象ide磁盘)。
MTD_CHAR provides raw character access to the flash, while MTD_BLOCK projects the flash as a normal block device (like an ide disk), on which a filesystem can be created.
这和Linux虚拟磁盘如何使用大相径庭；标准的Linux虚拟磁盘是块设备，所以在使用它们之前必须用您选择的文件系统将其格式化。
This is very different from how Linux ramdisks are used; standard Linux ramdisks are block devices, so they must be formatted with a filesystem of your choice before you can use them.
used 列显示了该文件系统或设备上已使用的块数。
The used column shows the number of blocks that have been used on the file system or device.
mke2 fs是用于在任何设备上创建ext2文件系统的实用程序—它创建超级块、索引节点以及索引节点表等等。
Mke2fs is the utility used to create an ext2 filesystem — creating the super block, inodes, inode table, and etc — on any device.
loop设备是一个设备驱动程序，利用它可以将文件作为一个块设备挂载到系统中，然后就可以查看这个文件系统中的内容了。
The loop device is a device driver that allows you to mount a file as a block device and then interpret the file system it represents.
而且传统的虚拟磁盘是个块设备，并需要一个mkfs之类的命令才能真正地使用它，tmpfs是一个文件系统，而不是块设备；您只是安装它，它就可以使用了。
And while a traditional ramdisk is a block device and requires a MKFS command of some kind before you can actually use it, TMPFS is a filesystem, not a block device; you just mount it, and it's there.
诸如Ext2fs和JFFS2等大多数其它文件系统都驻留在底层块设备之上，而tmpfs与它们不同，它直接位于VM上。
Unlike most other filesystems like Ext2fs and JFFS2, which reside on top of the underlying block device, TMPFS sits directly on top of the VM. Thus mounting the TMPFS filesystem is a simple affair.
一种按固定长度数据块来存储数据的磁盘存储设备，这些数据块按相对于某文件开始的块号进行寻址。
A disk storage device that stores data in blocks of fixed size; these blocks are addressed by block number relative to the beginning of the particular file.
一种按固定长度数据块来存储数据的磁盘存储设备，这些数据块按相对于某文件开始的块号进行寻址。
A disk storage device that stores data in blocks of fixed size; these blocks are addressed by block number relative to the beginning of the particular file.
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