Question

How many bytes of memory space are there in an 80GB hard disk in (B in GB stand for bytes)

Answer 1

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80,000,000,000 bytes

80,000,000,000 bytesHard drive makers however assume that 80GB means 80,000,000,000 bytes, since they use the definition of 1GB = 1,000,000,000 bytes. SSD vendors thus use the same definition. Now 80,000,000,000 bytes actually equals 74.5GB, so that's all the space you get to use on the drive.