创建一个1GB的文件：
C:\>fsutil file createnew D:\testfile.txt 1073741824
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wmic logicaldisk where caption="c:" get size,freespace,caption | findstr /v /i "caption"
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用dd创建一个指定大小的空文件
dd if=/dev/zero of=bigfile bs=1024k count=1 seek=10000
dd if=/dev/zero of=yourfile bs=1M count=5
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