仔细查看，就会发现硬盘事实上在扇区之间包括大量额外数据，这些额外字节由磁盘固件使用，以检测和纠正每个扇区内的错误。
When you look closer, hard disks actually include a great deal of extra data in between sectors. These extra bytes are used by the disk's firmware to detect and correct errors within each sector.
通常需要采用差错控制码来检测和纠正由信道失真引起的信息传输错误。
Usually there is need to use error control coding to detect and correct those transmission errors caused by signal distortion.
接下来，使用调试器检测并纠正在运行时检测到的逻辑错误和语义错误等问题。
Next, the debugger is used to detect and correct such problems as logic errors and semantic errors that are detected at run-time.
接下来，使用调试器检测并纠正在运行时检测到的逻辑错误和语义错误等问题。
Next, the debugger is used to detect and correct such problems as logic errors and semantic errors that are detected at run-time.
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