Network links are quoted in blank per second, while file sizes are in bytes, so a 1 Gbit/s link moves at most about 125 MB/s: divide by blank.

Answer

Network links are quoted in bits per second, while file sizes are in bytes, so a 1 Gbit/s link moves at most about 125 MB/s: divide by 8.

Also accepted: bit for bits; eight for 8.

Why

Mixing up Mbit and MB is the most common bandwidth mistake in an estimate, and it is off by a factor of eight.

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