block layer

基本解释

The block layer has undergone major changes in 2.5 development.
块层在2.5的开发过程中经历了大幅度的变化。
The Linux block layer component of this is called a discard request, which results from a higher-level file system file deletion.
Linux 的这个块层组件称为丢弃请求，它来自于更高级别的文件系统的文件删除。
A discard request is part of the block layer and provides the means to discard blocks, eventually resulting in a trim command to a supporting ATA drive.
一个丢弃请求是此块层的一部分，提供了丢弃块的途径，并最终会导致向提供支持的 ATA 设备发出一个 trim 命令。

Its brawny design — including double-layer cinder-block walls reinforced by heavy duty steel bars and cement piers that plunge 30 feet into the ground — should allow it to withstand winds up to 200 mph.
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The launcher shoots the bottles at a velocity of 984 feet per second, fast enough to smash a double-layer breeze-block wall and allow assault troops to enter a building, according to the manufacturer, BCB International.
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