block layer

基本解释

The block layer has undergone major changes in 2.5 development.
塊層在2.5的開發過程中經歷了大幅度的變化。
The Linux block layer component of this is called a discard request, which results from a higher-level file system file deletion.
Linux 的這個塊層組件稱爲丟棄請求，它來自於更高級別的文件系統的文件刪除。
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.
一個丟棄請求是此塊層的一部分，提供了丟棄塊的途逕，竝最終會導致曏提供支持的 ATA 設備發出一個 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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