Because groundwork adopting ferroconcrete structure is chosen in advance, drive error of theodolite working on it is very little and can be ignored.

由于地基是事先选好的，多采取钢筋混凝土结构，经纬仪借助于地基环固定在地面上，工作时带动误差非常小，可忽略不计。

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The Error Checking utility scans the hard drive for bad sectors, and scans for file system errors to see whether certain files or folders are misplaced.

错误检查工具扫描硬盘的坏扇区，并扫描文件系统错误，检查是否某些文件或文件夹是错误的。

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Q I'm getting a Grub 1.5 Error 21 after installing Ubuntu on an external hard drive.

我在一台外接硬盘上安装了Ubuntu之后发生了Grub 1.5的21号错误。

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This standard 9.5mm drive leverages Advanced Format, which increases the physical sector size from 512 bytes to 4, 096 (4K) bytes to improve drive capacities and error correction capabilities.

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The WarpDrive card helps to ensure high reliability with a management infrastructure offering extensive monitoring, including health, error rate and drive failure.

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But if the dir command results in the error message "Invalid drive specification, " go back and try again.

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