/dev/urandom
- https://github.com/hobbyquaker/speedtest/releases/download/v1.0/testfile-1MByte
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- https://github.com/hobbyquaker/speedtest/releases/download/v1.0/testfile-5MByte
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- https://github.com/hobbyquaker/speedtest/releases/download/v1.0/testfile-10MByte
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- https://github.com/hobbyquaker/speedtest/releases/download/v1.0/testfile-25MByte
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- https://github.com/hobbyquaker/speedtest/releases/download/v1.0/testfile-50MByte
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- https://github.com/hobbyquaker/speedtest/releases/download/v1.0/testfile-100MByte
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- https://github.com/hobbyquaker/speedtest/releases/download/v1.0/testfile-250MByte
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